ML20054J963

Offnormal Event Procedure 05-1-02-I-3, Single MSIV Closure, Safety-Related, Revision 10

ML20054J963
Person / Time
Site:	Grand Gulf
Issue date:	03/24/1982
From:	MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20054J949	List: AECM-82-280, Forwards 37 Offnormal Event Procedures in Response to ACRS Subcommittee Request at 810917-18 Meeting ML20054J952 ML20054J953 ML20054J963 ML20054J965 ML20054J968 ML20054J971 ML20054J972 ML20054J974 ML20054J975 ML20054J979 ML20054J980 ML20054J982 ML20054J983 ML20054J986 ML20054J990 ML20054J992 ML20054J993 ML20054J996 ML20054J998 ML20054J999 ML20054K001 ML20054K004 ML20054K008 ML20054K009 ML20054K012 ML20054K013 ML20054K016 ML20054K019 ML20054K021 ML20054K024 ML20054K026 ML20054K030 ML20054K031 ML20054K033 ML20054K034 ML20054K036 ML20054K039 ML20054K040
References
05-1-02-I-3, 5-1-2-I-3, NUDOCS 8206300244
Download: ML20054J963 (3)

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r, PLANT OPERATIONS MANUAL Volume 05 05-1-02-I-3 Section 02 Revision:

10 Date: 3-24-82 OFF-NORMAL EVENT PROCEJURE SINGLE MSIV CLOSURE SAFETY RELATED Prepared:

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GRAND GULF NUCLEAR STATION OFF-NORMAL EVENT PROCEDURE

Title:

Single MSIV Closure No.:

05-1-02-I-3 Revision:

10 Page: 1 l

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4 1.0 PURPOSE / DISCUSSION 1.1 To provide instructions for the operator following a Main Steam Line Isolation Valve (MSIV) failing closed, not including a complete MSIV isolation.

1.2 This procedure may interface with the reactor scram procedure ONEP 05-1-02-I-1, with several Emergency Procedures, and with the Emergency Plan.

EP-1, Level Control, covers a complete MSIV isolation.

1.3 An MSIV may fail closed due to the loss of RPS power to both solenoids, loss of accumulator air pressure, or energizing of the tes t solenoid.

In RUN mode, a Reactor Scram may occur if, at high power the proper combination of MSIV's are > 6% closed. Also, if one MSIV goes full closed, the pressure spike could cause a flux spike on the Neutron Monitoring System suf ficient to cause a scram.

SYMPTOMS 2.1 Possible reactor scran due to a pressure induced high flux trip or Group I Isolation.

MSIV position indicating lights indicate valve closure.

2.2 n

2.3 Increase in Reactor power, reactor pressure, other main steam line flows, feedwater flow, and generator output transient.

2.4 Power spikes on the Neutron Monitoring Recorders 2.5 High flux annunciators on the Neutron Monitoring System 3.0 AUTOMATIC ACTIONS l 1 3.1 Possible reactor scram 3.2 Possible Group I Isolation due to high flow in other steam lines. This may cause safety-relief valve actuation.

4.0 D4 MEDIATE OPERATOR ACTIONS 4.1 Verify automatic actions have occurred, as applicable.

4.2 If scram has occurred, refer to ONEP 05-1-02-I-1, Reactor Scram.

I 4.3 Determine and correct the cause of the closed MSIV.

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s, GRAND GULF NUCLEAR STATION OFF-NORMAL EVENT PROCEDURE

Title:

Single MSIV Closure th). :

05-1-02-I-3 Revision: 10 Page:

2 4.4 If scram has not occurred, reopen the closed MSIV per SOI 04-1-01-B21-1 5.0 SUBSEQUENT ACTIONS 5.1 Proceed to impleme nt the Emergency Plan if directed by the Shift Supervisor / Shift Superintendent.

5.2 If the closed MSIV(s) have been reopened, continue to operate tne plant in accordance with I0I 03-1-01-2, Power Operation.

5.3 If a single closed MSIV cannot be reopened, reduce reactor power as directed by the Reactor Engineer and Shift Supervisor / Shift Superintendent.

5.4 Refer to Technical Specification Section 3/4.4.7, Main Steam Line Isolation Valves LCO.

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