ML20005G351

Forwards Addl Info Supporting NRC Review of Proposed Revs to Tech Spec 3/4.1.3, Movable Control Assemblies

ML20005G351
Person / Time
Site:	Callaway
Issue date:	12/28/1989
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20005G352	List: ML20005G351 ML20005G355
References
ULNRC-2129, NUDOCS 9001190034
Download: ML20005G351 (6)

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'1901 Gr tiot Street

W Post Office Box 149 St Louis, thssouriC3166 314 554 2650 n

Gyg9y Donata,sanen S], r[w Pesent E12craic oecemser 28, 1989 f

83 U. S.~ Nuclear Regulatory Commission Attn:- Document Control Desk Mail Station P1-137 Washington, D.C.

20555 Gentlemen:

ULNRC-2129 DOCKET NUMBER 50-483 CALLAWAY PLANT REVISION TO TECHNICAL SPECIFICATION 3/4.1.3 MOVABLE CONTROL-ASSEMBLIES

Reference:

ULNRC-2055, dated August 2, 1989 The purpose of this letter is to provide-

. additional information to support the NRC staff-review of the: proposed revisions to the Callaway Technical Specifications concerning Movable Control Assemblies.

The proposed Technical Specification revision was transmitted to the NRC.by the referenced letter.

The attachments to this letter provide additional justification for-the proposed revisions to Technical-Specification 3/4.1.3 and a clarified version of the proposed revisions incorporated into the existing Technical Specification.

If you have any additional questions concerning this matter, please contact me or D. E.

Shafer of my staff.

Very trulyfours, f

/ Donald F.

Schnell 6 ~-

JMC/jal Attachments

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3 Alan C.

Passwater, of lawful age,.being,first. duly. sworn i

.upon oath'says,that he is Manager,, Licensing and Fuels (Nuclear)'for N

Union Electric. Company; that he has read'the' foregoing document and.

t knows.:the content ~'thereof; that he'has. executed the'same for-and on behalf'of'~said'-company with full. power and authority to do so; and

-that-the' facts >therein stated are true and correct to-the best of his

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-Alan C.

Passwater Manager Licensing-and Fuels 4

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BARBAR FAF NOTARY PUBLIC, STATE OF MISSOURI l-MY COMMISSION EXPIRES april 22, 1993 l

ST. LOUIS COUNTY.

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CFA, Inc.

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Gaithersburg, MD 20879 R. C.. Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission 4

- Region: III 799 Roosevelt Road

' Glen Ellyn, Illinois 60137 Bruce Little Callaway Resident Office U.S. Nuclear' Regulatory Commission

'RR#1 Steedman, Missouri 65077 Tom Alexion-(2)

Office of Nuclear Reactor Regulation U.S.. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E21

-11555 Rockville Pike Rockville, MD 20852 m

Manager, Electric Department Missouri.Public Service Commission P.O.

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. Jefferson. City..MO 65102 Ron Kucera'

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Rod Control-Action Statement Compliance Times ib '

This correspondence supports efforts to extend the compliance time of

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Tech Spec 3.1.3.1b from six hours to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, if the rods are inoperable but Ltrippable. llistorically, the subject action statement has boon entered on five different occasions, and the plant was subsequently shut down on three of those occasions..

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Extending the compliance time would accomplish the following:

1.

Allow sufficient time to: evaluate the nature of the failure and to develop a systematic work plan.

2.

Allow sufficient time to perform troubleshooting activities in a deliberate and systematic manner.

3.

. Avoid' distractions to control room personnel.

Under the existing action statement the control room must be making shut down preparations in parallel with supporting I&C troubleshooting of rod control system.

4.

. Some of the electronic f ailures will randomly occur during nights and

-weekends..The proposed toch spec change would allow time for the most experienced people available to. travel to the plant, to plan and perform the work..The longer compliance time would also permit consultation with vendor-personnel as necessary.

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In the event of parts unavailability, the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> would allow sufficient time to.get part from another plant.

6.

This would also reduce the potential for requiring the plant to cycle

'down and back up, due to electronic failures in Rod Control. This in turn would reduce exposure to safety system challenges during those evolutions.

In summary the proposed tech spec change would greatly improve the troubleshooting scenario. This would reduce the chances of unnecessary 1 challenges to safety systems by reducing the chances of dropping a rod while troubleshooting.

This would also reduce exposure to safeguard system challenges due to shutting down and starting up.

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' 't Technical Specification Inserts

-Insert _A ACTION:

The ACTION-to be taken.s based on the cause of inoperability of control rods as_follows: Any immovability of a control rod initially invokes ACTION Statement 3.1.3.1.a.

Subsequently ACTION Statement 3.1.3.1.a.may-

.be exited and ACTION Statement 3.1.3.1.d invoked if either the rod

-control urgent failure alarm is illuminated or an electricc1 problem 4

~is. detected in the rod control system.

l ACTION l

l More Than CAUSE OF INOPERABILITY

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One Red One Red I

1-Immovable as a result of excessive

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(a)

(a)

-friction or mechanical interference l

or known to be untrippable.

2.

Misaligned by more than + 12 steps (c)

(b)

(indicated position) from its group step. counter demand height or from any other rod in its group.

3.

Inoperable due to a rod control urgent (d)

(d)

' failure alarm or other electrical l

problem in the rod control system, but trippable, i

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Insert B For purposes of determinin5 compliance with Specification 3.1.3.1, any immovability of a control rod initially invokes ACTION statement 3.1.3.1.a.

Subsequently, ACTION statement 3.1.3.1.a may be exited and ACTION statement 3.1.3.1.d invoked if either the rod control urgent failure alarm is illuminated or an electrical problem is detected in the rod control system.

The rod is considered trippable if the rod was demonstrated OPERAELE during the last performance of Surveillance Requirement 4.1. 3.1. 2 and me t the rod drop time criteria of Specification 3.1.3.4 during the last performance of Surveillance Requirement 4.1.3,4 l