L-76-386, Application for Proposed Amendment to License No. DPR-067. Proposed Change Concerns Revision to Surveillance Requirement 4.8.1.1.2.C.6 to Verify Operability of the Automatic Sequence Timers

Application for Proposed Amendment to License No. DPR-067. Proposed Change Concerns Revision to Surveillance Requirement 4.8.1.1.2.C.6 to Verify Operability of the Automatic Sequence Timers

ML18096B500
Person / Time
Site:	Saint Lucie
Issue date:	11/08/1976
From:	Robert E. Uhrig Florida Power & Light Co
To:	Stello V Office of Nuclear Reactor Regulation
References
L-76-386
Download: ML18096B500 (9)

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'0-DOCKET NUMBER FILE NUMBER NRC DISTRIBUTION FoR PART 50 DOCI(ET MATERIAL DATE OF DOCUMENT TO: Mr Steklo Florida Pwr 6 Light Co 11-8-76 Miami, Fla R E Uhrig oATE REcEIvED 11 ].2 76 LETTER 0 NOTOR IZED PROP INPUT FORM NUMBER OF COPIES RECEIVED

'g 0 R IG INAL QVNC LASS IF I E 0 Qcopv 3 signed DESCRIPTION ENCLOSURE Ltr trans the following: Amdt to OL/Change to Tech Specs: Consisting of revisions with regard,to acceptance criteri to verify operability of the automatic sequenc timers.....

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~ PJ If I FLORIDA POWER & LIGHT COMPANY November 8, 1976 L-76-386 Director of Nuclear Reactor Regulation Attention: Mr. Victor Stello, Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Was'hington, D. C. 20555

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Dear Mr. Stello:

Qp,gj4cS Re: St. Lucie Unit 1 Docket No. 50-335 Proposed Amendment to Facilit 0 eratin License DPR-67 In accordance with 10 CFR 50.30, Florida Power & Light Company submits herewith thr'ee (3) signed originals and forty (40) copies of a request to amend Appendix A of Facility Operating License DPR-67.

The proposed amendment is described below and is shown on the attached Technical Specification pages bearing the date of this letter in the lower right hand corner.

Page 3/4 8-4 Specification 4.8.1.1.2.c.6 is revised such that the acceptance criteria used to verify operability of the automatic sequence timers is changed from +10% to +1 second.

The proposed amendment has been reviewed by the St. Lucie Plant Facility Review Group and the Florida Power & Light Company Nuclear Review Board. They have concluded that the proposal does not involve a significant hazards consideration and, there-fore, does not require prenoticing pursuant to 10 CFR 2.105.

A written safety evaluation is attached.

Very tru yours, OOCKEPEO Robert E. Uhrig USNRC Vice President NOV >&976 REU/MAS/cpc U.S. PtUCIEAR PEQVl COM cc I SS lO Iftftll Sect Attachment cc: Mr. Norman C. Moseley, Region Robert Lowenstein, Esquire II X3 SSO PEOPLE... SERVING PEOPLE

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.ELECTRICAL POWER SYSTEMS SURVEILLAHCE REQUIREMENTS (Continued) the auto-connected emergency loads through the load sequencing system and operate for > S,minutes while the generator is loaded with the emergency loads.

c) Verifying that on the safety injection actuation signal, all diesel generator trips, except engine overspeed and generator differential, are automa-tically bypassed.

Verifying the diesel generator set operates for > 60 minutes while loaded to > 3500 kw.

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5. Verifying that the auto-connected loads to each diesel generator set do not exceed ".he 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 3730 kw.

6. Verifying that the automatic sequence timers are OPEPABLE with each load sequence time within +)1 second of i,ts required value.

d. At least onc'e per 18 months by verifying that each fuel transfer pump transfers fuel from each fuel storage tank to the engine mounted fuel tanks on each diesel via the installed cross con-nection lines.

4.8.1.1.3 The Class 1E underground cable system shall be demonstrated OPERABLE:

a. Within 30 days after the movement of any loads in excess of 80:

of the ground surface design basis load over the cable ducts by pulling a mandrel with a diameter of at least 80'.l of the duct's inside diameter through a d.ct exposed to the maximum loading (duct nearest the ground's sur ace) and verifying that the duct has not been damaged.

b. At least once per 18 months, during shutdown, by:

1. Selectino on a rotating basis at least 3 (one each in the d cts between the diesel generators and tne switchgear, between the switchgear and the component cooling water pump motors, and between the switchgear and the intake cooling water pump motors) Clos's 1E 5000 volt underground cables and megger test4ig .the selected cables at a minimu,'n test, ST. LUCIE UNIT'1 3/4 8-4 11-8-76

SAFETY EVALUATION Introduction This safety evaluation supports a proposed change to St. Lucie Unit 1 Technical Specification 4.8.1.1.2.c.6 such that the acceptance criteria used to verify the operability of the automatic sequence timers may be changed from +10% to +1 second.

Discussion The current specification requires verification that automatic sequence timers are operable with each load sequence within

+10% of its required value. However, in the cases where required values are less than 10 seconds, this means verification down to fractions of a second, and such verification is not assurable.

D In addition, for values over 10 seconds the +10% specification allows load blocks to occur simultaneously or even in reverse sequence. For instance, with the +10% tolerance, the 15 second load group could occur as late as 16.5 seconds while the 18 second load group could occur as early as 16.2 seconds. This could reverse the two groups (which is undesirable) or allow two load groups, both within present specification tolerances, to be loaded onto a diesel generator simultaneously (which is unacceptable). It is proposed that .the acceptance criteria be changed to + 1 second to provide a meaningful, repeatable sur-veillance which ensures proper separation of load groups.

The proposed amendment does not involve any physical change to the facility.

Conclusions Based on these considerations, (1) the proposed change does not

,increase the probability. or consequences of accidents or mal-functions of, equipment important to safety and does not reduce the margin of safety as defined in the basis for any technical specification, therefore, the'hange does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common public.

defense and security or to the health and safety of the 11-8-76

STATE OF FLORIDA )

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COUNTY OF DADE )

E. A. Adomat , being first duly sworn, deposes and says:

That he is Executive Vice President of Florida Power Light Company, the Licensee herezn; That he has executed the foregoing document; that the state-ments made in this said document are true and correct to the best of his knowledge, information, and belief, and that he is authorized to execute the document on behalf of said Licensee-E. A. Adomat Subscribed and sworn to before me this day of

"""'HOTZRY PUBLIC, in a fo the County of Dade, NOTARY PUBLIG STATE OF FLORIDA AT LARGE MY COMMISSION EXPIRES NOV. '30 l 979 1;i @ P

<<gy@commission expires. BQNDED THRU GENERAL INs. UNDERwRITERS

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