3F0684-05, Forwards Response to IE Bulletin 84-02, Failure of GE Type Hfa Relays in Use in Class IE Safety Sys. Two Mod Approval Records Written to Replace 50 safety-related Relays & 63 nonsafety-related GE Hfa Relays

Forwards Response to IE Bulletin 84-02, Failure of GE Type Hfa Relays in Use in Class IE Safety Sys. Two Mod Approval Records Written to Replace 50 safety-related Relays & 63 nonsafety-related GE Hfa Relays

ML20092M647
Person / Time
Site:	Crystal River
Issue date:	06/07/1984
From:	Westafer G FLORIDA POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
3F0684-05, 3F684-5, IEB-84-02, IEB-84-2, NUDOCS 8407020334
Download: ML20092M647 (4)

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'l 84 JUN N AIO: 07 "Qg Florida P...o.w..e. r June 7,1984 3F0684-05 Mr. 3. P. O'Reilly Regional Administrator, Region 11 Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission

- 101 Marietta Street N.W., Suite 2900 Atlanta, GA 30303

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 IE Bulletin 84-02 Failure of GE Type HFA Relays In Use In Class IE Safety Systems

Dear Sir:

Athched is Florida Power Corporation's response to the subject IE Bulletin. Staff time to do the requested review was 200 manhours. Staff time to prepare the requested documentation was 160 manhours.

Sincerely,

's G. R. Westafer Manager, Nuclear Operations Licenslag and Fuel Management Attachments

'AEF/feb cc:

Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 8407020334 840607 PDR ADOCK 05000302 G

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.6 @ff#CE M1 Thirtn fourth Street South e P.O. Box 14042, St. Petersbur$. Florida 33733 e 813-866 5151

7 LE. BULLETIN 84-02 FAILURE OF GE TYPE HFA RELAYS IN USE IN CLASS 1E 5AFETY SYSTEMS FLORIDA POWER CORPORATION'S RESPONSE 1.

Plants in Operation I.E. Bulletin Reauireraent Develop plans and schedules for replacing (1) nylon or Lexan coil spool-type HFA a.

relays used in normally energized safety-related applications and (2) nylon coil spool-type HFA relays used in normally de-energized safety-related applications.

The replacement relays and any replacements made in the future should meet the requirements of the applicable IEEE standards.

The replacement program for energized and de-energize.d relays should be performed on a "best efforts" basis during plant outages of sufficient duration.

The entire replacement program should be completed within two years from the date of this bulletin.

' The replacement schedule should consider the following recommended priority:

Nylon or Lexan normally energized in the reactor trip system.

Nylon or Lexan normally energized in other safety-relat'.:d applications.

Nylon normally de-energized in the reactor trip system.

Nylon normally de-energized in other safety-related applications.

FPC Response -

Two Modification Approval Records (MARS) have been written to replace 50 safety-related relays and 63 non-safety-related GE HFA relays. The MARS also include procedures for functional testing of the new installed relays.

Due to the critical function of these relays it is not advisable to change the relays on-line. Relays will be replaced each outage of sufficient duration between now and Ref r1 V and, by the end of Refuel V, all HFA-51 series relays will be replaced with the aew type HFA relays.

I.E. Bulletin Requirement b.

During the period before relay replacement, develop and implement surveillance plans that include:

(1)

Monthly functional tests of al reactor trip system normally energized relays that verify relay contacts change state when the relay coil is de-energized.

(2)

Visual inspections of a_Il safety-related normally energized relays as soon as practical upon receipt of this Bulletin. Thereafter, similar inspection:

should be accomplished in conjunction with the monthly functional test.

These visualinspections should verify that relay coils are not deteriorating (e.g., fr.spect coil bobbins for visible cracks or melting), and should confirm cleanliness of the relay pole pieces.

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j-FPC Response Procedure SP-905, GE Type HFA Relay Spwl Piece Inspection, was written on October 10, 1983, ar d performed to establish a periodic surveillance (initial, then every six months) of the GE HFA relays which will detect coil spool piece deterioration and i

establish their integrity until the spool pieces are replaced.

(1)

Crystal River Unit 3 does not have GE HFA type relays in the Reactor Trip System.

i (2)

On September 9,1983, a work request was initiated to identify all GE HFA relays that were installed in safety systems. During this effort, it was determined that the identification of all GE HFA relays installed at CR-3 would be desirable so that more reliable trend data could be collected and all problems identified.

r A total of 121 GE HFA relays were identified. Of the total, 58 were in safety systems and 63 were in non-safety systems. During the inspection of the 58 safety-related relays, 8 were discovered to have cracked or broken coil spool pieces, were replaced, and satisfactorily passed functional testing.

I.E. Bulletin Reauirement

c. Provide a basis'for continuing' operation for the period of time until the normally energized relays are replaced. This basis should include a discussion of those measures

' addressed in Items la and Ib and any other preventive and/or corrective measures

.taken or planned.

FPC Response SP-905 requires a spool piece integrity test if any signs of deterioration are observed during'the visual inspections. An initial inspection followed by a 6 month inspection i

have been performed to-date. No additional anomalies were identified during these inspections.

The actions already taken, combined with the continuing periodic inspection provide assurance that Crystal River 3 can be safely operated until all of these relays are replaced.

I.E. Bulletin Recuirement l

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d. Provide a written report of the above actions, including schedules for completion.

This report is to be submitted to the NRC within 120 days of receipt of this bulletin.

FPC Response All nylon or Lexan coil spool-type HFA relays in both safety and non-safety-related applications will be replaced by the end of' Refuel V, currently scheduled for Spring 1985.

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..- a STATE OF FLORIDA COUNTY OF PINELLAS.

G.R.' Westafer states that he is the Manager, Nuclear Operations Licensing and Fuel Management for Florida Power Corporation; that he is authorized on the part of said company to sign and file with the Nuclear Regulatory Commission the information attached hereto; and

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that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information, and belief.

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G.R. Westafer

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Manager, Nuclear Operations Licensing and Fuel i

Management i

Subscribed and sworn to before me, a Notary Public in and for the State and County above named, this 7th day of June 1984.

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Notary Pubhc I

l Notary Pub'ic, State of Florida at Large, My Commission Expires: November 19,1986 l

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