ML20079K612
| ML20079K612 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/10/1991 |
| From: | J. J. Barton GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C321-91-2270, NUDOCS 9110230151 | |
| Download: ML20079K612 (2) | |
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GPU Nuclear CorpoteHon Nuclear
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F oded Rwer. Nea Jetter 00731 0369 609 971-4000 Wnt&6 Dm t DJ Nuffhr C321-91-2270 octobet ; o, ! 991
- 11. 5. Nuclear Regulatory Commission Att:
Document Control Desk Washington, DC 20555 Gentlemen:
Subject:
Oyster Creek Nuclear Generating Station (OCNGS) facility Operating License No. DPR-16 Docket No. 50 219 Containment Vent and purge o $lation Valves
Reference:
(1) NRC letter, October 10, 1986, " Containment Purge and Vent Isolation Valves (HPA B-24. TAC 59828)."
With respect to your letter of October 10, 1986, the amount of containment atmosphere that would be released through the vent and purge isolation viilves before their closure, subsequent to a LOCA, has been conservatively determined to be approximately 425 lbm.
The calculated release thro g h valves V 28 17 and V 28 18 (whose closing times exceed 15 seconds) is 32 lbm and represents less than 10% of the total calculated release through all vent and purge isolation valves.
The Staff's safety evaluation of January 21, 1986 concluded that the site boundary dose was acceptable assuming a containment atmos)here release of 2000 lbm for the vent and purge isolatbn valves.
Because tie actual containment atmosphere released is less than that assumed in the Staff's safety evaluation, closure times greater than 15 seconds for valves V-28 17 and V-28 10 are justified since acceptable site boundary doses are not exceeded.
The Staff requested Technical Specification cht. tes imposing additional leakage testing of containment vent and purge va.ives with resilient seals because of concerns with seal deterioration attributed to harsh environments and frequent valve use.
GPUN has determined that additional testing is not necessary. The valves are located in environments which are within the manufacturers' temperature and radiation limits and, in addition, the resilient seals are replaced in t.ccordance with the manufacturer's recommendations.
Seal wear due to frequent use is not a concern.
Valves V-27-1 through 4; V-23-13 through 16 and V-28 17 and 18 are normally closed.
They are only operated in the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period preceeding a shutdown, up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following a startup, when a leak test is performed and for drywell entries. They may also be operated in accordance with procedures following accident ronditions.
V-28-18 is full stroke exercised for operability every 3 months.
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C321 91 2270 Page 2 With respect to including valve closure time in the Technical Specifications, GPUN believes it is inappropriate to include the containment vent and purgo valve closure times in the OCNGS Technical Saccifications.
The information is contained in the fSAR.
Inclusion in the Tecinical Specifications would not enhance the clarity of the existing document.
This is consistent with industry efforts to improve plant Technical Specifications.
Sincerely, y
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icePf sident and Directw ar reek JJB/RTZ/p1p cc: Administrator, Region 1 Senior NRC Resident inspector Dyster Creek NRC Project Manager C3212270.LE f
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