ML18025A577

Pennsylvania Power & Lights 11/18/1975 Letter, Informing of Bechtels Tests on a Spent Fuel Ventilation Exhaust System (Sfves), Resulting in Improved Design Changes to Reactor Building Ventilation System, Zone III (RBVS III)

ML18025A577
Person / Time
Site:	Susquehanna
Issue date:	11/18/1975
From:	Curtis N Pennsylvania Power & Light Co
To:	Butler W Plant Licensing Branch 1
References
13231, 840-1, ER 100450, PLA-93
Download: ML18025A577 (3)

Text

NRC DISTRIBUTION FOR PART BO DOCKE1 MATERIAL (TEMPORARY FORM)

. CONTROL NO:

FILE'ROM:

Penn.

Power 6 Light Co

Allentown,'a DATE OF DOC

'11-18-75 DATE R EC'D 12-8-75 LTR XXX TWX RPT OTHER TO:

CLASS DL UNCLASS PROP INFO ORIG one signed INPUT CC OTHER NO CYS REC'D SENTIIEC PDR~

SENT LOCAL PDR DOCKET NO:

50-387 8

DESCR IPTION:

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ENCI OSUR ES Spent Fuel Pool Ventilation Exhaust System study.......(10 cys encl rec'd)

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~. PLANTNAME: Susquehanna 1 6 2 FOR ACTION/INFC: 8 MATION 12-10-'75 ehf

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~>-~~~~<r-0 Attn:

Dr. halter R. Butler, Chief Light 1'(ator Roactox's Branch No. 1-2 SUSQUEHANNA SES REACTOR BUILDING VENTlLATXONSYSTEM ER 100450 FILE 840-1 PLA-98

Dear Dr. Butler:

Docket Nos.

50-387 and 50-388

<)II t. PAQ'IJ II Ilk 4 VUF l At PP5L's request, Bechtel performed tests on the Spent, Fuol Ventilation Exhaust System (SFVES) at an operating plant.

Attached is tho report con-taining descriptions of the tests and recommendations for improvements in design.

As a result of this study, the Susquehanna design is being changed to improve the performance of the Reactor Building Ventilation System, Zone III (RBVS III).

The SFVES is being deleted and its function replaced by the RBUS lII.

The RBVS XII system capacity has been increased by 38,000 SCBi to 92,450 SCF51 to com-pensate for the deleted SFVES which had been designed to remove 38,000 SCB1 of aix fxom the space above tho spent fuel pool, reactor cavity and dryer/separator pool.

The RBVS III is now oriented such that all air is supplied along one wall of the xeactor building, and is normally exhausted along the opposite wall, thus pro-viding a sweeping air flow across tho pool.

The exhaust system has boon further modified to exhaust, air fxom directly above the pool when the water temperature to air temperature xatio is high causing water vapor to rise above the pool and escape tho normal sweep pattern.

During this operating mode, the normal wall exhaust ducts can be isolated with dampers.

Attached is a inarked-up copy of PSAR Piguro 5.3.1A showing the system changes.

Figures S.3.1B and S.3.1C will have idontical modifications.

The necessary changes to the PSAR are in preparation and will be submitted in a later amendment.

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y+c PENNSYLVANIA POWER 8

L IGMT

~32 RO M P A N Y

Page 2

If you requir'e additional information, please'et.us know.

Very truly yours, N. W. Curtis V.P.-Engineering 5 Construction WEB:MAS