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<td><a href="https://misportal.jlab.org/ll/index.jsf?function=view&lessonId=1165">ACC-21-1029 Acid Exposure During SRF Cavity Preparation</a></td>
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<h2 style="white-space:nowrap">Statement of Lessons Learned</h2>
<pre>A weakness in the cavity rinsing process lead to two employees being unexpectedly exposed to hydrofluoric acid due to incomplete rinsing of a component.
<img src=" https://misportal.jlab.org/ll/downloadAttachment?attachmentId=6329" width="250px"></pre>
<h2 style="white-space:nowrap">Discussion of Activities</h2>
<pre>On October 29, 2021, two Accelerator Division employees were preparing niobium cavities for electro-polishing when one noticed a small amount of liquid on their pants and the area was slowly discoloring. Recognizing the potential that the liquid could be from acidic rinsewater the employees immediately used test strips to determine if the liquid was acidic. The test indicated that the liquid was acidic so the employees notified their supervisor and applied calcium gluconate to the affected area. Residual droplets of water on the cavity adapters was then found, and also tested. These results were also positive for fluoride. This indicated that the part had been contaminated with hydrofluoric acid (HF). </pre>
<h2 style="white-space:nowrap">Analysis</h2>
<pre>Following Jefferson Lab emergency procedures for potential HF acid exposure the employees called 911 and both were transported to the hospital for medical evaluation. The second employee did not feel or observe any liquid on their skin or clothing but was working alongside the first so was transported out of an abundance of caution. A physician determined neither employee suffered injury and both were released for full duty with no restriction.
In reconstructing the sequence of events, it appears a small amount of acidic rinsewater was trapped behind an o-ring on an adapter during the rinse process. Since the adapters are triple rinsed per standard procedure all traces of acid should have been removed and safe for the employees to handle without wearing personal protective equipment (PPE).
</pre>
<h2 style="white-space:nowrap">Recommended Actions</h2>
<pre>Validate the adapter components' rinsing and drying process: 1) Design a validation plan, 2) Performing the validation exercise and collect the data, 3) Review and analyze the data to determine if the process is effective. Continue process improvements until results provide adequate results.
Work with Occupational Medicine to revise the existing guidance regarding first-aid and emergency response to cover a broader spectrum of exposures (i.e. both high and low concentrations of acids). Provide training on the revised guidance to all affected personnel.
Follow up with Emergency Response Hospital to determine whether they are aware that HF is in use at Jefferson Lab and confirm that their personnel have the knowledge and equipment to respond appropriately to incidents of HF exposure.
</pre>
<h2 style="white-space:nowrap">JLab Preventive Measures</h2>
<pre></pre>
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<h2>Comments</h2>
<h5 style="white-space:nowrap">1/25/2022 3:12:16 PM by Bailey, Mary Jo</h5>
<pre>Submitted to those current in
SAF125: First Aid for Chemical Exposures</pre>
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<fieldset>
<legend>Summary</legend>
<table>
<tr class="row">
<td class="label" nowrap>Lesson ID:</td>
<td class="dataval">1165</td>
</tr>
<tr class="row">
<td class="label" nowrap>Status:</td>
<td class="dataval">OK</td>
</tr>
<tr class="row">
<td class="label" nowrap>Doc ID:</td>
<td class="dataval">2022-JLAB-1165</td>
</tr>
<tr class="row">
<td class="label" nowrap>Priority:</td>
<td class="dataval">Caution</td>
</tr>
<tr class="row">
<td class="label" nowrap>Safety Related:</td>
<td class="dataval">YES</td>
</tr>
<tr class="row">
<td class="label" nowrap>Originator:</td>
<td class="dataval">Bailey, Mary Jo</td>
</tr>
<tr class="row">
<td class="label" nowrap>Issued:</td>
<td class="dataval">1/25/2022 3:01:33 PM</td>
</tr>
<tr class="row">
<td class="label" nowrap>Approved By:</td>
<td class="dataval">Bailey, Mary Jo</td>
</tr>
<tr class="row">
<td class="label" nowrap>Approved On:</td>
<td class="dataval">1/25/2022 3:12:16 PM</td>
</tr>
<tr class="row">
<td class="label">Source:</td>
<td class="dataval">
TJNAF NE
</td>
</tr>
<tr class="row">
<td class="label" nowrap>Location:</td>
<td class="dataval">TJNAF</td>
</tr>
<tr class="row">
<td class="label" nowrap>Cost Savings:</td>
<td class="dataval"></td>
</tr>
<tr class="row">
<td class="label" nowrap>Contact:</td>
<td class="dataval">Tony Reilly, Senior SRF Engineer (areilly)</td>
</tr>
<tr class="row">
<td class="label" nowrap>Queued Emails:</td>
<td class="dataval">140</td>
</tr>
<tr class="row">
<td class="label" nowrap>Sent Emails:</td>
<td class="dataval">0</td>
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<tr class="row">
<td class="label" nowrap>Viewings:</td>
<td class="dataval">1 times</td>
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<li>SAF125: First Aid for Chemical Exposures</li>
</ul>
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<legend>Distribution/Notification</legend>
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<li>*Division Safety Officers (DSOs)</li>
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<li>*DOE Notification</li>
<li>*ESH&Q Liaisons</li>
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