ML20115A598
| ML20115A598 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/08/1992 |
| From: | Gates W OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-92-311R, NUDOCS 9210140402 | |
| Download: ML20115A598 (2) | |
Text
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gi Omaha Pubile Power District
-444 South.16th Street Mdl Omaha. Nebraska 68102-2247 402/6n2000 a
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'). 5. N, 7equlatory Ccmmission Att:
Oc:.. A Control Desk Mail St atior:.1-l' 7 a
Washirutca, Dt 20555 s
REFEACNCES: 1.
Docket No. 50-285 2.
Letter from 0 PPD (W.
Gates) te NRC (Document Control Desk) dated July 30, 1991 91-177R) 3.
Letter fron, NRC (S.
Bloom) to GPPD @. 3 Gates) dated August 24, 1992 Gentlemen:
SUBJECT:
worrective Actions for Post Accident Sampling System Dissolved Gas Analysis Omaha Public Power Distiict (OPPD) requested in Reference 2 that a commitment to u e the Post Accident Sampling ) System (PASS) autcetted dissolved gas analysis sequence for reactor coolant (RC be deleted and credit instead be taken for grab samph 3 and subsequent off-site analysis. Reference 2 was initiated to resolve a longstanding problem with the reliable operation of this PASS function.
Troubleshooting and corrective actions through July 1991 were not successful in cc*recting the automated dissolved gas analysis problems.
In Reference 3. the NRC denied the OPPD request submitted by Reference 2.
The NRC also requested that OPPD provide details of the actions and schedule for resolving problems with the dissolved gas equipment in the PASS.
Following is OPPD's response ta this request.
With the assistance of the original PASS designer, OPPD has determired that the existing PASS equipment should be usable with certain changes.
OPPD has subsequently implemented a course of actions as noted below to resolve the aforementiened problems.
Upon completion of these actions, OPPD is reasonably certain that the PASS dissolved gas analysis sequence for RC will reliably meet or exceed applicable requirements consistent with the original design intent.
The original PASS designer has evaluated the dissolved gas equations and the programmable controller sequencing, and has recommended changes. An independent evaluation of the dissolved gas equations has confirmed the equati results.
Pertinert valves were hydrostatically tested to vertfy their impermeas 'ity. The actual volumes have been verified for the three flasks used by tN PASS to mehsure liquids and gases.
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.4 Huclear Regulatory Commission LIC-92-311 Page 2 Actions not yet complete include performing additional measurements after system modification to add drain taps and determine which piping is not drained between the sequencer cycles. The programmable controller sequencer logic may be changed to incorporate pre-cooling of the RC sample. When the above tasks are completed, validation testing of the system will
'.,e performed to verify that the PASS dissolved gas equipment is operable and that the calculated resuits meet the Reg.
Guide 1.97 accuracy requirements.
PASS operating instructions and related chemistry pi edures will then be revised.
OPPD plans completion of the system modification, sequencer changes, validation testing, analysis, and inputs to related doct.mentr. by February 19, 1993.
Document revision approval is scheduled by April 2,1993. Completion of related personnel training is scheduled by May 14, 1993. OPPD will notify the NRC of any changes to this schedule.
h.3 If you should have any questions, please contact me.
~I Sincerely, r
i l' $. 5{,:crj l
W. G. Gates Division Manager Nuclear Operations WGG/tcm c:
LeBoeuf, Lamb, Leiby & MacRae J. L. Milhoan, NRC Regional Administrator, Region IV R. P. Mullikin, NRC Senior Resident Inspector S. D. Bloem, NRC Project Manager l
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