ML18030A261

Discusses SER Outstanding Issue 34 Re long-term Cooling Capabilities W/Leakage from First Isolation Valve Outside Suppression Pool.Capability Would Not Be Impaired. Suppression Pool Water Could Be Made Up by Listed Methods

ML18030A261
Person / Time
Site:	Susquehanna
Issue date:	04/16/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
PLA-729, NUDOCS 8104210438
Download: ML18030A261 (4)

Text

REGULATOR Y INFOR'lATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8104210438 DOC ~ DATE: 81/04/16 NOTARIZED:

NO DOCKET FACIL:50-387 Susquehanna Steam Electric StationR Unit 1R Pennsylva 0

50 388 Susquehanna Steam Electric Station>

Unit 2R pennsylva 00038 AUTH BYNAME AUTHOR AFFILIATION CURTISR N ~ W ~

Pennsylvania Power 8 Light Co.

RECIP ~ NAME, RECIPIENT AFFILIATION YOUNGBLOOORS.J ~

Licensing Branch 1

SUBJECT:

Discusses SER Outstanding Issue 34 re long term coolinq capabilities w/leakage from first isolation valve outside suppression pool. Capability would not be impaired, Suppression pool water could be made up by listed methods.

DISTRIBUTION CODE'OS IS COPIES RECEIVED'LTR -1 ENCL g SIZE:~

TITLE: PSAR/FSAR AMDTS and Related Corresoondence NOTES;Send IS,E 3 copies FSAR 8 all amends'end ILE 3 copies FSAR 8 all

amends, 05000387 05000388 RECIPIENT ID CODE/NAME ACTION ~

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TOTAL NUMBER OF COPIES REQUIRED:

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TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONEr (215) 770-5151 NORMAN W. CURTIS Vice President-Engineering IL Construction-Nuc!ear 770 5381 Mr. B. J.

Youngblood Licensing Branch bl U.

S. Nuclear Regulatory Commission Washington, D.

C.

20555 April 16, 1981 IIl5a

~r"

/

Docket Nos.

50-387 and 50-388 Susquehanna Steam Electric Station SER Outstanding Issue No.

34 Leakage from first isolation valve (6.3.2.3)

ER100450 File 841-2 PLA-729 Reference PLA-695

Dear Mr. Youngblood:

Long term cooling capabilities are not impaired by a leak from the first isolation valve outside the suppression pool.

Suppression pool water leakage (assumed to leak past the valve stem packing) can be made up by several methods.

Leakage into the ECCS pump room will not flood high enough to communicate with other rooms.

By maintaining water levels in the suppression pool, water level will eventually level out in the ECCS room stopping the leak.

This assures long term cooling capabilities with the suppression pool.

There are many methods of making up suppression pool water by either putting additional water directly into the suppression pool or into the vessel (assuming a

LOCA).

The following are a couple of suggestions:

l)

Ultimate Heat Sink water can be pumped into the Suppression Pool via the RHR service water pump discharge cross tie to the RHR system.

Several sources of water are available to the UHS such as the Makeup Water System (River Water) or by gravity from the cooling tower basins.

2)

Makeup water is available via the Makeup Demineralizer System to the Condensate Storage Tank>then via either the CS, system or through the condenser Hotwell and Condensate Pump to the Reactor.

3) If circumstances or time permits, 'additional makeup pagh are available which require steam or manual valve operation in the Reactor building.

ebb 5

) 0 8 3 0 4 2 2 0 //AT PENN 5 Y LVANIA POWER tL L I G HT COIAPANY

Mr. B. J.

Youngblood April 16, 1981 Page two These are the

RCIC, HPCI or condensate transfer pump from the Condensate Storage Tank to the Reactor or directly from the makeup demineralizer system via the suppression pool fill line.

4) If health physics allow, a recirculation path similar to that allowed on LaSalle can be set up by opening a manually operated floor drain valve in the ECCS pumps room.

Drainage goes to the'iquid radwaste,then eventually to the Condensate Storage Tank then returned via several of the methods described above.

Very truly yours, N.

W. Curtis Vice President-Engineering and Construction-Nuclear CC:

R.

M. Stark bss:

N.

W. Curtis W.

E. Barberich B. A. Snapp C.

T. Coddington R. J. Shovlin