ML20077N506

Part 21 Rept Re Defective 3/8 inch,3-way Solenoid Valve Model Supplied by Automatic Switch Co.Cv Valves Will Be Specified on Future Purchase Order W/Actual Test Values Requested for Each Valve

ML20077N506
Person / Time
Site:	Calvert Cliffs
Issue date:	08/09/1991
From:	Creel G BALTIMORE GAS & ELECTRIC CO.
To:	Office of Nuclear Reactor Regulation
References
REF-PT21-91 NUDOCS 9108140344
Download: ML20077N506 (3)

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BALTIMORE GAS AND ELECTRIC CHARLES CENTER

• P.O. BOX 1475

• BALTIMORE, MARYLAND 21203 1475 Gromot C CRCCL V8C C PRE SIDtNT Nuestan Entwo, 000 aco-4 4ss August 9,1991 U. S. Nuclear Regulatory Commission Washington,DC 20555 ATTENTION: Director, Office of Nuclear Reactor Regulation

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 10 CFR Part 21 Report on ASCO Solenoid Valves Gentlemen:

Baltimore Gas and Electric has discovered a condition that we believe meets the criteria of a defect in a basic component as defined in 10 CFR Part 21. This letter provides the information required to be reported to the Nuclear Regulatory Comr :,4sion pursuant to 10 CFR Part 21. A verbal notification was made to Region I headquarters on August 8,1991.

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' Office of Nuclear Reactor Regulation August 9,1991 l' age 2 Should you have any further questions regarding this matter, we will be pleased to discuss them with you.

Very truly yourc - [

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STATE OF MARYLAND:

TO WIT:

COUNTY OF CALVERT :

I hereby certify that on the Y day of busf ,19 9/, before me, the subscriber, a Notary Public of the State of Maryland in anil for Calvert Ccun4/ ,

personally appeared George C. Creel, being duly sworn, and states that he is Vice' President of the Baltimore Gas and Electric Company, a corporation of the State of Maryland; that he provides the foregoing response for the purposes therein set forth; that the statements made are true and correct to the best of his knowledge, information, and belief; and that he was authorized to provide the response on behalf of said Corporation.

WITNESS my Hand and Notarial Scal: bM ,

Notary Public l My Commission Expires: ;c u<mw M,/W Date /

GCC/JV/bjd Attachment cc: D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., N RC T. T. Martin, NRC L E. Nicholson, NRC R.1. McLean, DNR J. H. Walter, PSC

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A'ITACIIMENT 0)

' 10 CFR PART 21 REPORT ON ASCO SOI,ENOll) VAINES Calvert Cliffs Nuclear Power Plant, Units 1 and -2 Docket Nos: 50-317 and 50-318

' Page 1 of 2 (1) Name and address ofIndividual making notification:

G. C. Creel, Vice-President, Nuclear Energy Division Baltimore Gas and Electric Charles Center P. O. Box 1475 Baltimore, MD 21203 -

(11) Basic Component Affected:

3/8 inch,3-way, solenoid valve model 206-381-5RF l

(ill) - Firm Supplying Component:

Supplier / Fabricator:

Automatic Switch Company (ASCO)

Florham Park, NJ.-

(iv) Nature of the Defect:

ASCO solenoid valve exhaust flow coefficients (Cv) are as much as 50 percent less than the Cv values listed in ASCO catalogs.- ASCO has stated that the pub!ished values are an average _

of the exh_aust and charging modes of all solenoid valves of each model tested. ASCO also

- stated that this methodology is used throughout catalog NP-1, and that the Cv listed could c

- not. and should not be used for sizing a_ solenoid valve. :llowever, the Engineering Information Section of ASCO catalog #32 uses Cv exclusively for valve sizing and selection.

This information, though not provided in NP 1, is;not exclusive to catalog' #32 because it -

applies accepted principles and formulac. At Calvert Cliffs, Cv is evaluated to determine its

impact on control valve stroke time. The averaging method described by ASCO essentially _

renders this parameter meaningless.. In addition, dimensional deviations that reduced Cv in some of these solenoid valves resulted from production prob! cms. Control valve stroke times could have exceeded Technical Specification limits, resulting in a Significant Safety IIazard.

L (v) Date on Which defect was identifled:

L L We determined on August 8,1991, that this defect could create a Substantial Safety IIazard.

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. .: - = A'ITACilMifNT (1) 10 CFR PART 21 REPORT ON ASCO SOLEN 0ll) VAINES

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(vi) Numtwr and kication of components:

There are twenty-four of these solenoid valves affecting Safety Related Control Valves in Salt Water, Service Water, and Component Cooling Water systems.

(vil) Corrective Actions Takem Cv values will be speciGed on future purchase orders of ASCO valves listed in NP-1, with

-- actual test values requested for each valve.

A NETWORK message has been sent on this bsue to make industry personnel aware of the limitation of the Cvs listed in NP-1.

- All solenoid _ valves in Safety Related applications already have post-maintenance testing performed that would find excessive stroke times before defective valves could be placed in setViCc.

Seven solenoid valves that were sent back to ASCO were reworked to increase Cv.

All valves that did not meet stroke time specifications were replaced.

(vill) Other advice related to Purchasers or Licensees:

None.

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