ML20050C700
| ML20050C700 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 04/01/1982 |
| From: | Bayne J POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.28, TASK-TM JPN-82-35, NUDOCS 8204090268 | |
| Download: ML20050C700 (2) | |
Text
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POWER AUTHORITY OF THE STATE OF NEW YORK 10 Col.uMaus CIRCLE NEw YORK. N. Y.10019 t2126 397 6200 GEORCET.8ERRY PetSIDthf & C e44 4 F T R L:S T E E S opamatino crescan JOHN S DYSON JOHN W. BOSTON r"asseor$v noCrounas GEORGE L. ING ALLS veC E CuainwaN JOSEPH R. SCHMIEDER anacutive vset P#E DEht & CH4EF RfCH ARD M FLYNN ROBERf I Mit LON28 LEROY W. SINCLAIR April 1, 1982
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C F RE oE miC.c R.
C L A R.c JPN-82-35 THOM AS R FREY esNION w8CE PRESID4NT
& GEh8 A AL COuhSEL I
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Director of Nuclear Reactor Regulation
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1 U. S. Nuclear Regulatory Commission Washington, D. C.
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Attention:
Mr. Domenic B. Vassallo 2
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-l Operating Reactors Branch No. 2 gang g
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Division of Licensing ElW Meer a DDC
Subject:
James A.
FitzPatrick Nuclear Power Plant 8
Docket No. 50-333 y
e Qualification of ADS Accumulators NUREG-0737 Item II.K.3.28
Reference:
PASNY letter, J. P.
Dayne to T. A. Ippolito, dated January ll, 1982 (JPN-82-7)
Dear Sir:
In the reference letter, the Power Authority stated that the BWR Owners' Group generic study of this item would be reviewed to determine if modifications to the FitzPatrick plant are required. This review has been completed and the Power Authority considers the FitzPatrick ADS accumulator design adequate to assure short and long term core cooling.
The existing ADS accumulators (one per valve) were designed to provide ADS safety / relief valve ( SRV ) actuations at 70% of the drywell design pressure.
For pipe breaks resulting in a higher drywell pressure, sufficient reactor depressurization occurs due to the break to preclude the need for ADS.
The accumulators are sized to provide two actuations at this pressure, although only one actuation is required to depressurize the reactor.
Therefore, the FitzPatrick design includes an adequate short term capability to place the reactor in the shutdown cooling mode.
The ADS accumulators are normally supplied with nitrogen from the nuclear safety grade Containment Atmospheric Dilution (CAD) System via instrument air headers inside containment.
Although the instrument air headern are not safety grade, they are protected from the consequences of postulated pipe breaks requiring ADS for mitigation. In addition, the two headers are physically separated except for one short, common run of piping, near the penetration inside the drywell. A backup supply of air is available from the Lh 8204090268 820401
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, Instrument Air (I A) System. Both systems have ample capacity to supply the ADS accumulators for an extended period of time.
Even in the unlikely event that neither the I A or CAD systems are available, the ADS system has the capability of providing two (2) actuations within approximately two hours.
All of these desi gn features provide the ADS System with the long term capability to maintain the reactor in the shutdown cooling mode.
The Power Authority considers the existing FitzPatrick ADS design adequate without modification. Therefore, this response completes the Authority's efforts on NUREG-0737 Item II.K.3.20.
If you have any further questions, please do not hesitate to contact us.
Very truly yours,
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yne Sen1 Vice President Nuclear Generation JPD/JG cc:
Mr. J. Linville Resident Inspector U.
S. Nuclear Regulatory Commission P. O. Box 136 Lycoming, New York 13093 Mr. Ron Barton United Engineers & Constructors, Inc.
30 S.
17th Street Philadelphia, PA 19101