AECM-82-300, Proposed Change to Tech Spec 3/4.6.5,drywell post-LOCA Vacuum Breakers

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Proposed Change to Tech Spec 3/4.6.5,drywell post-LOCA Vacuum Breakers
ML20054L603
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 07/02/1982
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20054L602 List:
References
AECM-82-300, NUDOCS 8207080289
Download: ML20054L603 (2)
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Text

.. . Attachment 3 to AECM-82/300, Page 1 of 2

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Proposed Change to Operating License (PCOL-82/02)

.. m

%' i MISSISSIPPI POWER & LIGHT COMPANY b

'(Y =:"

Helping Build Mississippi P. O. B O X 16 4 0. J A C K S O N. MISSISSIPPI 39205 June 10, 1982 NUCLEAA PRCOUCTioN DEPARTMENT U.S. Nuclear Regulatory Commission Office of Nuclear . Reactor Regulation Washington, D.C. 20555 Attention: Mr. Harold R. Denton, Director I

Dear Mr. Denton:

~

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2

, Docket Nos. 50-415 and 50-417

. File 0272/M-632.0/M-222.0 Transmittal of Proposed Technical Specification Change, Post-LOCA Vacuum Relief and Drywell Purge Vacuum Breaker Position Indication

. AECM-82/186 This letter transmits a proposed revision to the GGNS Technical Specifications pertaining to the drywell post-LOCA vacuum breakers and supporting justification. Associated with this issue are certain in-strumentation changes for the check valves in the post-LOCA vacuum relief and drywell purge systems.

Both the post-LOCA vacuum relief and the drywell purge systems consist of a motor operated butterfly type isolation valve in series with the vacuum breaker check valve (s) which provides drywell vacuum relief.

Both the vacuum breakers and isolation valves were provided with, position

- . indication. (See GGNS FSAR Figure 6.2-81).

During onsite testing of the vacuum breakers (check valves F001A,B, F002A,B, and F004A,B in FSAR Figure 6.2-81) to assure actuation on 1.0 psid pressure, several factors caused sufficient resistance to prevent the proper opening and closing of the valves. The valves were reworked and modified to operate within their design requirements, however, the lever arms when contacting the position switches did not allow the valves to fully close. Therefore, the position switches and lever arms were subsequently removed from the check valves.

The motor operated isolation valves which are in series with the check valves, operate by the same 1.0 psid pressure and are provided with position indication. Based on this, Mississippi Power & Light (MP&L) contends that position indication on the check valve vacuum breakers is not required.

AE201 8207080289 820702 PDR ADOCK 05000416 P PDR

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, . . . - . _ _ _ . . . . _. _._ Member Middle South Utilities System _c.._.- .._ -_~h a

Attachment 3 to AECM-82/300, Page 2 of 2 Proposed Change to Operating License (PCOL-82/02) AECM-82/186

. MISSISSIPPI POWER & LIGHT COMPANY 9' t' .

A proposed revision to Section 3/4.6.5, "Drywell Post-LOCA Vacuum Breakers," of the GGflS Technical Specifications is attached.

The Limiting Condition for Operation and Surveillance Requirements are revised to indicate the use of position indication on the isolation

valves instead of the vacuum breakers. The Technical Specifications on the Drywell , Purge System are presently correct and no revision i is required.

In addition, two other corrections are provided in Technical Specification Section 4.6.5, which indicate a revision to the surveillance

, requirements based on .the GGflS post-LOCA vacu.um breaker design.

Subsection 6.2.5.5 of the GGflS FSAR was revised in Amendment 55 to show position indication only on the isolation valves in the post-LOCA and drywell purge systems. FSAR Figure 6.2-81 will be revised in a future amendment to delete positi,on indication on the check valves discussed above.

flotwithstanding the above, MP&L intends to provide position indication with qualified non-contact type switches on the vacuum breakers as an operator aid. Switches for this application, qualified to flVREG-0588, are currently not available but are expected to be provided during the first regularly scheduled refueling outage.

This modification is being proposed as an operator convenience and is not considered a licensing requirement.

Please advise if any additional information is required. -

Yours truly, 4

L. F. Dale

(,, 4 / Manager of fluclear Services I

SAB/JGC/JDR:lm Attachment

! cc: Mr. fl. L. Stampley (w/a)

Mr. G. B. Taylor (w/a)

Mr. R. B. McGehee (w/a)

Mr. T. B. Conner (w/a)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement

! U S. fluclear Regulatory Commission l -

Washington, D.C. 20555 Mr. J. P. O'Reilly, Regiunal Administrator (w/a)

Office of Inspection & Enforcement l

U.S. fluclear Regulatory Commission Region II 101 Marietta St. , fl.W. , suite 3100 l Atlanta, Georgia 30303 l

l AE2U2 _ ,

_ _ , _ ___,__,_.m . , ' ;4

Attachment 6 to AECM-82/300, Page 1 of 2 Attachment to AECM-82/186 Proposed Change to Operating License (PCOL-82/02)

CONTAINMENT SYSTEMS 3/4.6.5 DRYWELL POST-LOCA VACUUM BREAKERS LIMITING CONDITION FOR OPERATION 3.6.5 All drywell post-LOCA vacuum breakers shall be OPERABLE and closed.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2 and 3.

ACTION:

a. With one drywell post-LOCA vacuum breaker inoperable for opening but known to be glosed, restore the inoperable vacuum breaker to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next.12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
h. With one drywell post-LOCA vacuum breaker cpen, restcre the open vacuum breaker to the closed position within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
c. With the position indicator of an OPERABLE drywell post-LOCA vacuum breaker isolation valve inoperable, verify the isolation valve to l be closed at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by local indication.

Otherwise declare the isolation valve inoperable.

SURVEILLANCE REQUIREMENTS 4.6.5 Each drywell post-LOCA vacuum breaker shall be:

a. Verified closed at least once per 7 days,
b. Demonstrated OPERABLE:
1. At least once per 31 days by:

a) Cycling the vacuum breaker and isolation valve (s) through at least one complete cycle of full travel.

b) Verifying the position indicator for the vacuum breaker isolation valve OPERABLE by observing expected valve movement during the cycling test.

2. At least once per 18 months by:

a) Verifying the pressure differential required to open the vacuum breaker, from the closed position, to be less than or equal to 1.0 psid by use of an equivalent test weight and lever arm on the vacuum breaker, and Crand Gulf - Unit 1 3/4 6-45

e Attachment 4 to AECM-82/300, Page 2 of 2 Attachment to AECM-82/186 Proposed Change to Operating License (PCOL-82/02)

SURVEILLANCE REQUIREMENTS (cont.)

b) Verifying the position indicator for the vacuum breaker isolation valve OPERABLE by performance of a CHANNEL CALIBRATION.

3. By verifying the OPERABILITY of the vacuum breaker isolation valve differential pressure actuation instrumentation with the opening setpoint of 1.0 psid by l performance of a:

a) CHANNEL CHECK at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b) CHANNEL FUNCTIONAL TEST at least cnce per 31 days, and c) CHANNEL CALIBRATION at least once per 18 months.

Grand Gulf - Unit 1 3/4 6-45 (cont.)

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