ML20093K440

Provides Response to GL 95-07, Pressure Locking & Thermal Binding of Safety-Related,Power-Operated Gate Valves

ML20093K440
Person / Time
Site:	Calvert Cliffs
Issue date:	10/13/1995
From:	Denton R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-95-07, GL-95-7, NUDOCS 9510240214
Download: ML20093K440 (4)

Text

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,o R=r 17 E. DENTON Baltimore Gas and Electric Company Vice President Calvert Cliffs Nuclear Power Plant Nuclear Energy 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 586 2200 Ext.4455 Local 410 260-4455 Baltimore October 13,1995 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 60-Day Response to NRC Generic Letter 95-07: Pressure Locking and Thermal Bindina of Safety-Related. Power-Operated Gate Valves

REFERENCE:

(a)

Letter from Mr. D. M. Crutchfield (NRC) to Mr. R. E. Denton (BGE),

dated August 17,1995, NRC Generic Letter 95-07: Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves The purpose of this letter is to fonvard our 60-day response to NRC Generic Letter 95-07: Pressure Locking and Thermal Binding of Safety-Related, Power-Operated Gate Valves. Pressure locking or thermal binding can cause a power-operated valve to fail to open. The generic letter requests that we l

perfonn, or confirm we previously performed, evaluations of operational configurations of safety-related, power-operated gate valves (i.e., subject valves) for susceptibility to pressure locking and thermal binding.

Power-operated valves include those valves that are motor, air, or hydraulically-operated. In addition, it requests that we perform further analyses, and any needed corrective actions, to ensure that the susceptible valves are capable of performing their safety functions as described in our current licensing basis.

l Attachment (1) describes our plans for implementing the action (s) requested by the generic letter. We will j

keep you informed of any changes to our schedule for implementing the requested actions.

240010 9510240214 951013 J

PDR ADOCK 05000317 P

PDR l

B f f 2 0 8 ').S Y i o f

. Document Control Desk October 13,1995

, Page 2 Should you have questions regarding this matter, we will be pleased to discuss them with you.

truly yours, U

r STATE OF MARYLAND

TO WIT:

COUNTY OF CALVERT.

M I hereby certify that on the I3tA) day of CA f AAA.1) (d,]E, before me, the subscriber,

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. personally Notary Public of the State of Maryland in and for appeared Robert E. Denton, being duly swom, and states that he is Vice Presider #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.

1 WITNESS my Hand and Notarial Seal:

Notary Public My Commission Expires:

< M r l9k (pate RED /JMO/ dim

Attachment:

(1) 60-Day Detailed Response to GL 95-07: Pressure Locking and Thermal Binding of Safety-Related, Power-Operated Gate Valves cc:

D. A. Brune, Esquire J. E. Silberg, Esquire L. B. Marsh, NRC D. G. Mcdonald, Jr., NRC T. T. Martin, NRC Resident Inspector, NRC R. I. McLean, DNR j

J. H. Walter, PSC.

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ATTAC11 MENT (1)

BGE 60 DAY DETAILED RESPONSE TO GENERIC I.ETT?.R 95-07:

• PRESSURE LOCKING AND THERMAL BINDING OF SAFETY RELATED, POWER-OPERATED GATE VALVES I.

Reauired Response

'Ihe generic letter requires Baltimore Gas and Electric Company (BGE) to submit the following:

Within 60 daysfrom the date of this generic letter, a written response indicating whether or not the addressee will implement the action (s) requested below. If the addressee intends to implement the requested action (s), provide a schedulefor completing implementation.

BGE Response We plan to implement the action (s) requested by the generic letter on a schedule that will ensure that the 90- and 180-day requested actions are completed by the dates given below. We will keep you informed of any changes to our schedule for implenwnting the requested actions.

II.

Reauested Actions A.

Within 90 days of the date of this generic letter, BGE is requested to perform and complete thefollowing actions:

1.

Perform a screening evaluation of the operational configurations of all safety-related, power-operated (i.e., motor-operated, air-operated, and hydraulically-operated) gate valves to identify those valves that are potentially susceptible to pressure locking or thermal binding; and 2.

Document a basis for the operability of the potentially susceptible valves or, where operability cannot be supported, take action in accordance with individualplant TechnicalSpecifications.

a i

BGE Response I

By November 15,1995, BGE will perform and complete the following actions:

Al.

Perform a screening evaluation of the safety-related function for operational configurations of the subject valves to identify the valves that are potentially susceptible to pressure locking or thermal binding and, as a result, could fail to open; and A2.

Document a basis for determining that the potentially susceptible valves are operable, or take action as required by our Technical Specifications.

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...s, ATTACHMENT m

~

BGE 60-DAY DETAILED RESPONSE TO GENERIC LETTER 95-07:

' PRESSURE LOCKING AND TilERMAL BINDING OF SAFETY-RELATED, POWER-OPERATED GATE

]

VALVES l

1 Reauested Actions i

B.

Within 180 days ofthe date ofthis generic letter, each addressee of this generic letter is requested to implement and complete the guidance provided in Attachment 1 of the generic letter to perform thefollowing actions:

1.

Evaluate the operational configurations of safety-related, power-operated (i.e., motor-operated, airsperated, and hydraulically-operated) gate valves in its plant to identify valves that are susceptible to pressure locking or thermal binding:

2.

Performfurther analyses as appropriate, and take needed corrective actions (or l

Justify longer schedules), to ensure that the susceptible valves identified in i

Question B.1 are capable ofperforming their intended safetyfunction(s) under all modes ofplant operation, including test configuration.

BCE Response By February 5,1996, BGE will perform the following actions-Bl.

Complete an evaluation of the operational configurations of subject valves to determine l

which ones are susceptible to pressure locking or thermal binding. Our evaluation will meet the intent of Attachment I to the generic letter. The generic letter attachment summarizes one acceptable approach to address the issue of pressure locking or thermal binding in the subject valves.

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B2, Perform further analyses as appropriate, and take needed corrective actions (or justify j

longer schedules), to ensure that the susceptible valves are capable of performing their 1

intended safety function (s) under all modes of plant operation, including test configuration.

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