L-78-180, Response to Nrc'S 5/17/1978 Letter, Fp&L'S Commitment to Complete Testing Concerning Resistance Temperature Detector Response Times by 12/1/1978

Response to Nrc'S 5/17/1978 Letter, Fp&L'S Commitment to Complete Testing Concerning Resistance Temperature Detector Response Times by 12/1/1978

ML18114A181
Person / Time
Site:	Saint Lucie
Issue date:	05/19/1978
From:	Robert E. Uhrig Florida Power & Light Co
To:	Reid R Office of Nuclear Reactor Regulation
References
L-78-180
Download: ML18114A181 (5)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTFM < RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: REID R W ORG: UHRIG R E DOCD ATE: 05/19/78 NRC FL PWR b LIGHT DATE RCVD: 05/24/78 DOCTYPE: LETTER NOTARIZED: NQ COPIES RECEIVED

SUBJECT:

LTR 3 ENCL 0 i RESPONSE TO NRC LTR DTD 05/17/78... FURNISHING INFO CONCERNING RESISTANCE TEMPERATURE DETECTOR RESPONSE TIMES OF SUBJECT FACILITY AND ADVISING STATUS REPT ALONG WITH THE FIRST SURVEILLANCE TEST RESULTS RE SUBJECT> WILL BE SUBMITTED BY 12/01/78.

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e FLORIDA POWER 8c LIGHT COMPANY May 19, 1978 L-78-180 fi 1

Office of Nuclear Reactor Regulation Attention: Mr. R. W. Reid, Chief Operating Reactors Branch 54 Division of Operating Reactors It U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Reid:

Re: St. Lucie Unit No. 1 Docket No. 50-335 Resistance Temperature Detector (RTD)

Res onse Times Xour letter of May 17, 1978, requested that FPL provide information to show that the RTD time constant will not exceed 8 seconds during the test interval of 18 months and to demonstrate the validity of the Loop Current Step Response testing methodology.

As suggested in your letter, and based upon the discussion held with your staff on May l9, 1978, in which certain testing require-ments were specified, we understand that the following combination of RTD replacement, increased testing frequency for all RTD's, and comparative methodological testing is acceptable:

l. Replacement of the 4 RTD's which were LCSR-tested in January 1978 with available spares.

2. Comparative testing of the 4 replaced RTD's, along with 4 new ones to be procured during Cycle 2, using both the previously accepted plunge test method and the LCSR method at both cold (170'F) conditions and, to the extent practicable, hot (540'F) conditions.

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Mf. M. W. Reid 0 May 19, 1978 Page Two L-78-180

3. Surveillance testing of all 16 safety-related RTD's using the LCSR method within 6 months and 12 months after Cycle 2 startup.

Xt is our commitment to complete the actions described above during Cycle 2. We expect to have some results from the comparative test program in approximately 6 months and will submit a status report, along with the first surveillance test results, by December 1, 1978.

Very truly yours, Robert E. Uhrig Vice President REU:MAS:sl cc: Mr. Peter B. Erickson Mr. James P. O'Reilly, Region Harold F. Reis, Esquire II