ML20077L566

Part 21 Rept Re Crosby Spring Relief Valve Failures Experienced During Testing at Facility.Evaluation Conducted to Determine If Safety Hazard Could Exist.Spring Changed to ASTM-A638 Grade 660,correcting Problem at Facility

ML20077L566
Person / Time
Site:	Beaver Valley
Issue date:	08/05/1991
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-91 ND3MNO:3167, NUDOCS 9108120353
Download: ML20077L566 (4)

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% i t. w;p . f r is r , , a n.t 11D3M110: 3167 Beaver Valley Power Station, Unit 110. 1 Docket llo. 50-334, License 110. DPR-66

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United States fluelear Re"l'd.:ory Comminnion Document Control Desh Washington, DC 20555 Gentlemen:

The following notitication report la being submitted under 10 CFR . Part 21. Thin innuo concerno Crosby opring relief valve failures experienced during tecting at Beaver Valley Unit 1.

The Baron Injection Tank Relief Valvo (BVPS Mark 11 0 .

RV-SI-857) providen overprennure rel.luf capabil .ity for the ik;ron Injection Tank. Information on the Relief Valve in an follown:

Mfg: Crouby Valve & Gage Co.

.Model 110: 50913M6 Style: JMAK-SPEC Mfg. Code: C710 Cronby Type: Globe Size: 3/4 inch The subject valve failed when the valve prenaturely lifted on two (2) separate occaajons during testing, both due to apring failures an a result of the spring material. The first failure occurred during the uixth refueling ot. tag e (6R) and the second failure occurred during the seventh refueling outago (7H). Jn correspondence with the vendor, it was learned that the recommended spr.ing material for thin valve van changed from the original carbon steel to stainless steel, and then to the present alloy steel ASTM-A638 grade 660,

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. August 5, 1991  !

ND3MNO!3167 pago two An ovaluation was conducted to datormine if a nubstantini safoty hazard could exist at DVPS Unit 1. In the event of a j natety injection (SI)- and the relief valvo littod prematurely l

, (at a presouro lower than the 2735 puhy notpoint), the high head  !

l safety injection flow that potentially would bo loot via the relief valve could renult in deg raded safety injection flow

, conditions, llowevo r, it was demonstrated during two actual SI events (LURG 88-007 and 89-007) that the rollof valvo perf ormed satisfactorily (i.e., did not lift prematurely). Thouc events occurrod during- the timo framu between the first and second tout L - f ailures of RV-SI-857 (6R and 7R tonting periods). After tho second tent failure of the rolsof valvo, the upring wan changed to the presently installed ASTM-A638 grade 660 and no additional fa11uros have been experienced. l l

An inventigation was inado to dotormine if this application affacted ether valvos at the sjte and the resulta- indicated

! thoro woro one.

l l The problem c. the spring material han been corrected at )

l Boavor Val 13y A apring of matorial typo ASTM *A638 grado 660 l I

wau inntalled during ?R. The station operated for thu nighth  !

fuel cycle with this npring installed. During the recent eighth' l refueling outago (BR), the valve was tected and oporated '

satisfactorily. Thin notico la being provided purnuant to the requiremonta of 10 CPR Part 21 (b). Thin informatiot. In also being provided -to the industry via the 1NPO Muclear Network .

system.

If there are any questiono regarding thin matter, plonce

.. .contcct John Maracek, (412)~393-5232.  ;

Very truly youre., ,

g'g' .huur/St.4;

~

[i T. P. Noonan General Manager

• Huclear Operations DC/ul Attachment l

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. August 5, 1991 ND311NO: 3167 Pago throo cet Mr. T. T. Martin, Regional Administrator United States Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406

c. A. Rotock,-ohio Edison

--76 S.-Main Street Akron, Oil 44J08 Mr. A. DeAgazio, DVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555-J. Deall, Nuclear Regulatory Commission, DVPS Senior Resident Inspector Larry Dock Centorior Energy 6200 Oak Troo Blvd.

Indopendenco, Ohio 44101-4661 INPO Recordo Contor Suite 1500 1100 circle 75 Parkway Atlanta, GA 30339 G. E.-Muckle, Factory-Mutual Engineering 680' Anderson Drivo #DLD10

~Pittsburgh, PA 15220-2773

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Mr. Rlchard Janati Departmont of Environmental Resources P. O. Box 2063-16th Floor, Fulton Building Harrisburg, PA 1712n

- Director,l Safoty ' Evaluation & Control Virginia Electric'& Power Co.

P.O. Box 26666 Ono James River Plaza Richmond, VA _

23261:

W. 11artley Virginia Power Company 5000 Dominion Blvd.

'2SW Glenn Allen, VA 23060

.J. M. Riddle NUS Operating Service Corporation i Park West II Cliff Mino Road Pittsburgh, PA 15275

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. :- ^ August 5, 1991

ND3MNOt3167

-* - Page four Bill Wegner, Consultant

-23 Woodlawn Terrace Fredricksburg, VA 22404 4

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