ML20087N345

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Responds to IE Bulletin 83-08 Re Operation of Circuit Breakers W/Undervoltage Trip Attachments Used in safety- Related Applications Other than Reactor Trip Breakers. Breakers Described in IE Bulletins 83-01 & 83-04 Not Used
ML20087N345
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 03/30/1984
From: Cutter A
CAROLINA POWER & LIGHT CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-83-01, IEB-83-04, IEB-83-08, IEB-83-1, IEB-83-4, IEB-83-8, NLS-84-138, NUDOCS 8404030357
Download: ML20087N345 (2)


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Cp&L Carolina Power & Light Company SERIAL: NLS-84-138

- MAR 3 01984 Mr. James' P. O'Reilly, Regional' Administrator

- United States Nuclear Regulatory Commission

. Suite 2900

- 101 Marietta Street, NW Atlanta, GA 30303 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT No. 2 DOCKET NO. 50-261/ LICENSE NO. DPR-23 RESPONSE TO IEB 83-08

Dear Mr. O'Reilly:

SUMMARY

In the Inspection and Enforcement Bulletin (IEB) 83-08, NRC requested that

- Carolina Power & Light Company (CP&L) provide information pertaining to operation of circuit breakers with un.:ervoltage trip attachments (WTAs) used in' safety related applications other than as reactor trip breakers (RTBs) at

/ the H. B. Robinson Steam Electric Plant Unit No. 2 (HBR2). Carolina Power &

Light. Company has reviewed this Bulletin and provides the following response.

, BACKGROUND,

^

Issued December. 28, 1983, IEB B3-08 required that CP&L identify safety related

. applications of the breakers cnd the systems in which they are used; review their design, testing, and maintenance adequacy in light of their operating experience and information in IEB 83-08; and evaluate the need for corrective actions.

- DTSCUSSION J

'The safety related breakers other than the RTBs used at HBR2 are the breakers on Emergency Buses El and E2 for safety- related pumps and fans, and the molded

- breakers on Motor Control. Center MCC-5, 6, 9, and 10 for valves of safety related systems.- Emergency buses El and E2 use external undervoltage relays which are not a part of the breakers, and some of the breakers on MCC-5, 6, 9 and 10 have encased'undervoltage relays. These relays are not similar to the WTAs described in 'IEB 83-01 and 83-04 and are not considered within the scope of'83-08. It should be noted that these undervoltage relays have not had reliability problems.

The non-safety.related Dedicated Shutdown (DS) System contains DS-416 and DS-532 breakers which have WTAs. The design criteria for these breakers do

.not take credit for their automatic action, and HBR2 procedures require that

. they are verified open prior to energizing. the DS system bus. Carolina Power

& Light Company is avare that other -plants are modifying DS-416 WTAs used for RTBs; and e.lthough these breakers are used only in a non-safety related system at ' HBR2, CP&L has ordered replacement WTAs for them. - g 8404030357 840330

-lDRADOCK 05000261-

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JJames P. d'Reilly MAR 3 01984 CONCLUSION Carolina Power & Light Company has determined . that circuit breakers with UVTAs as described 'in IEB 83-01 and 83-04 are not used in safety. related systems

- other than as RTBs at HBR2. Therefore, other actions required by IEB 83-08

.are not applicable. This' response provides the report of CP&L's actions as

required in the Bulletin..

- As requested, CP&L estimates the staff time required to prepare this response to be'100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />. If you have any questions concerning this response, please contact a member of our Nuclear Licensing Unit staff.

I Yours very ly, n

/

A. B. Cutter, Vice President s

Nuclear Engineering & Licensing CGL/pgp.(9767CGL).

l cc: Mr. J. P.~.0'Reilly '(NRC-RII)

Mr. G. Requa (NRC)

~

Mr. Steve Weise (NRC-HBR)

A..B. Cutter, having been first duly sworn, did depose and say that the information contained herein is true and correct.to the best of his information, knowledge and belief; and the sources of his information are officers,: employees, contractors, and. agents of Carolina Power & Light p o s """"81,, 4 Company.- #Jb,,,,({'g*%,

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Notary (Seal) g  : g,, E

- My commission expires: 8/4/78 -

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