ML20041B337

Interim Deficiency Rept Re HPCS Diesel Generator Radioactive Heat Loss Value Used in Sizing of HPCS Room Cooling Design. Revised Design Will Employ Same Size Cooling Fans as Used for Standby Diesel Generator Rooms

ML20041B337
Person / Time
Site:	River Bend
Issue date:	02/12/1982
From:	Booker J GULF STATES UTILITIES CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, RBG-12-112, NUDOCS 8202230539
Download: ML20041B337 (1)

Text

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V, GULF STATES UTELETEES COMPA POST OFP4CE BOX 2951

• 8EAUMONT, TEXAS 77704 A R EA C0DE 9 13 838-6631 February 12, 1982 RBG - 12,112 File Nos. G9.5, G9.25.1.1 t-

• Ch 9

Mr. John T. Collins, Regional Administrator t U. S. Nuclear Regulatory Commission REC 5fVED g'

Region IV, Office of Inspection and Enforcement -

I 611 Ryan Plaza Drive, Suite 1000 -

FEB 2 21902%-JJ j Arlington, TX 76011 G g D j ga*za

Dear Mr. Collins:

c, E RIVER BEND STATION UNIT 1 DOCKET NOS. 50-458 __

In Gulf States Utilities' (GSU) November 16, 1981, letter to Mr. Karl Seyfrit (NRC), GSU committed to advise the NRC of the status of the investigation into a condition potentially report-able under 10CFR50.55(e) concerning the HPCS diesel generator radiative heat loss value used in the sizing of the HPCS room cooling design.

The HPCS diesel rocm cooling design was based on a heat load provided to our architect-engineer (S&W) by General Electric (GE) who received the information from their t,ubvendor. GE has now confirmed that the appropriate heat load is approximately three times the value previously given. The initial design could have resulted in a low heat removal rate wnich could have per-mitted temperatures in the diesel room to rise above their design limits. GSU has not yet identified the specific deficiency in a QA Program which permitted this inappropriate data to be provided; however, GSU feels that this deficiency meets the reporting requirements of 10CFR50.55(e).

Since this item has been under investigation by GSU, we are able to provide as an attachment to this letter the details re-quired by 10CFR50.55(e)(3). GSU's investigation will continue 5@@]W/ ,

FEB 18122 h l bi lh 8202230539 820d!12 /

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PDR ADOCK 05000458 S PDR

c. Mr. John T. Collins -February 12, 1982 for some time. An interim or final report concerning the quality assurance aspects of this deficiency will be provided within 90 days.

Very truly yours, N-J. E. Booker ~l Manager-Engineering & Licensing- '

River Bend Nuclear Group

. Attachment cc: Director of Inspection & Enforcement U. S.LNuclear Regulatory Commission Washington, D.C. 20555 k

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ATIACHMENT HPCS DIESEL HEAT IDAD 10CFR50.55(e) 1 Description of the Deficiency Currently the high pressure core spray (HPCS) diesel room cooling fan is sized to renve heat at a rate of 769,000-BTU /hr. The cizing of the fan was specified by Stone and Webster (S&W) based on a heat removal rate provided by the General Electric Company (G.E.) of 522,000 BTU /hr. .Recently G.E. confirmed that the originally supplied heat rate was low by a factor.of approximately 3. Based on a new heat rate of approximately 1,719,000 BTU /hr., it is believed that the current design would have allowed the diesel room tem--

perature to rise unacceptably high under design conditions.

This deficiency is believed to represent a deficiency in the QA Program of G.E. or their subvendor who provided these estimates for use in design.

2. Safety Implications The initial design could have resulted in a low heat renval rate which could have allowed temperatures in the diesel room to rise above their design limits. This condition could have affected adversely the safety of operations of the nuclear power plant.

3. Corrective Action The cooling design of the HPCS diesel room is being revised to accamodate the new heat rate valve. This design will now employ the same size cooling fans as are used for the standby diesel generator rooms.

GSU's investigation into the problem that caused the design deficiency is currently under way.