ML20213G296
| ML20213G296 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 05/11/1987 |
| From: | Corbin McNeil Public Service Enterprise Group |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GL-87-05, GL-87-5, NLR-N87086, NUDOCS 8705180222 | |
| Download: ML20213G296 (2) | |
Text
4 Public Service Electric and Gas Company Corbin A. McNeill, Jr.
Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609 339-4800 Seror %ce Presdent -
Nuckar gay } { jgg7 N L R-N8 708 6 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:
RESPONSE TO NRC GENERIC LETTER 87-05 HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Public Service Electric and Gas Company (PSE&G) offers the following response with regard to Hope Creek concerning the potential degradation of Mark I drywell shells due to water corrosion induced wall thinning as referred to in the subject Generic Letter.
The collection of water in the drywell to cavity seal rupture drains is monitored by a level switch which will initiate an alarm in the control room when leakage is detected.
The drains at the bottom of the air gap and the refueling cavity liner leak detection drains are directed to floor or equipment sumps.
Instrumentation monitoring the fill-up time and pump-out time of these sumps will also initiate an alarm in the control room when excessive leakage is detected.
The occurrence of an alarm would cause operations personnel to initiate an investigation and assess whatever corrective actions would be necessary.
It should be noted that there are no gaskets at the drywell to cavity seal drains and that there is no sand cushion or metal seal plate at the bottom of the air gap.
Also, the fiberglass air gap forming system used during construction of the concrete shield wall is separated from the drywell by a two inch air gap.
Therefore, no mechanism exists to wet the drywell wall and promote the type of corrosion referred to in Generic Letter 87-05.
PSE&G feels that the design of the drains and the monitoring instrumentation discussed above provide adequate assurance that the leakage of water into the air gap will be detected and that water leakage will have no adverse affect on the structural integrity of the drywell.
As such, we feel that a specific program for surveillance of the drywell to cavity seal rupture drains or the drains at the bottom of the drywell air gap is not f
necessary.
O B705180222 B70511 9P PDR ADOCK 05000354 O
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hay 11387 Document Control Desk
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Concerning Table I of Generic Letter 87-05 ( Results of Mark I Containment Survey), the information shown is correct with regard to Hope Creek as qualified by the content of this letter.
Should you have any questions on the attached information, please do not hesitate'to contact us.
Sincerely, C.A.Mae.6,Jr.
S%
Attachment C
Mr. G.
Rivenbark Licensing Project Manager Mr.
R. W. Borchardt Senior Resident Inspector Mr. W. T.
Russell, Administrator Region I Director, Bureau of Radiation Protection Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628
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