ML19344A671

Application for Amend to License NPF-6,changing Tech Spec, Section 4.8.1.1.2.c.2 to Clarify Emergency Diesel Generator Load Block Application Timing Criteria.Class III Fee Encl

ML19344A671
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/12/1980
From:	Cavanaugh W ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19344A672	List: ML19344A671 ML19344A675
References
2-080-08, 2-80-8, NUDOCS 8008210429
Download: ML19344A671 (3)

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ARKANSA3 POWER & LIGHT COMPANY POST OFRCE BOX 551 UTTLE ROCK. ARKANSAS 72203 (501) 371-4422 August 12, 19 80 WILLIAM CAVANAUGH lli Vice President Generation & Constmetion 2-080-08 Director of Nuclear Reactor Regulation ATTN: Mr. R. W. Reid, Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Proposed Technical Specifications Change-To Clarify Emergency D.G. Load Block Application Timing Criteria (File: 2-1511.2)

Gentlemen:

This letter proposes a change to the Arkansas Nuclear One-Unit 2 (AND-2)

Technical Specification (T.S.). We wish to change section 4.8.1.1.2.c.2.

This change is requested for the reasons discussed below.

(1) In no case will load blocks be applied with worst-case Time Delay Relay settings closer than 1.0 second apart (Maximum response time for diesel-generator governor to re-achieve stability following load application or full-load rejection has consistently been

<1.0 sec., & typically on the order of 0.4 seconds. Voltage regulator response tine for upsets has been consistently demon-strated as being =0.3 seconds).

(2) In no case will component relay settings be unconservative related to total system response time specifications (see T.S. table 3.3-5).

(3) In no case will component relay settings exceed a variance band-width of 20% of the design time delay for that component (which corresponds to the design accuracy of the installed relays, of +10% of setting).

The proposed Tech. Spec. is drafted with the above consideration. Only major load blocks are included; those major components listed are those whose operability are directly specified elsewhere in the Technical Speci fications. Note that the remaining conponents' horsepower ratings from table 8.3-1 of the FSAR, when summed to any adjacent load block do not exceed the 800 H.P. single loading of the S.W. pump, hence, need not be individually specified.

8008210 Df MEMBER M OOLE SOUTH UTILITIES SYSTEM

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Mr. R. W. Reid Augus t 12, 1980 Note also that all safety features response times in T.S. teole 3.3-5

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except the containment spray pumps can be stated as D.G. response (15 sec. max.) + Design component tire delay + 5 sec. (typical) acceleration.

The containment spray system response time as specified allows for zero time delay positive variance and zero system hydraulic response and pump acceleration.

The applicable ANO-2 Technical Specification pages are included with a vertical line and a table noting the proposed changes. Pursuant to the requirements of 10 CFR 170.22, we have determined our amendment request to require a Class III fee as it involves a single safety issue. Accord-ingly, a check in the amount of $4,000 is remitted.

Ver . truly yours,

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/2 ~ra William Cav augh III /

WC/GAC/lp Attachment

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STATE OF ARKANSAS )

) SS l COUNTY OF PULASKI )

William Cavanaugh III, being duly sworn, states that he is Vice President, Generation & Construction, for Arkansas Power & Light Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Commission this Supplementary Information; that he has reviewed or caused to have reviewed all of the statements contained in such information, and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, informa-tion and belief.

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WILLIAM C H III g SUBSCRIBED AND SWORN T0 before me, a Notary Public in and for the County and State above named, this /e.2 day of , 1980.

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z FLAz NOTARY PUBLIC /

MY COMMISSION EXPIRES:

My Commason Expires 9/)/,81