ML20095E282

Confirms Commitments Re Emergency Diesel Generator Testing, Per 920417 Telcon.All Requirements of TS 3/4.8.1 Re Ac Sources Satisfactorily Completed.Loss of Offsite Power/ Safety Injection Tests to Be Performed,Per Reg Guide 1.108

ML20095E282
Person / Time
Site:	Seabrook
Issue date:	04/24/1992
From:	Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-REGGD-01.108, RTR-REGGD-1.108 NYN-92054, NUDOCS 9204270375
Download: ML20095E282 (8)

Text

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New Hampshire Ted C. Feigenbovm Y5ankee --

Cheef [ncutwe Othm NYN 92054 April 24,1992 Utdted statet. Nuclear Itegulatory Comrnission Washington, D.C. 20555 Attention: Document Control Desk it c lc r e nces: (a) l'acdity Operating License No. N01' 86, Docket No. 50 443 (b) Teleconference between J. M. Peschel, NilY, and G. II. lidison and

,l. C. Linville, USNitC, on April 17,1991,

• Compliance with Technical Specification 3/4.8.1, R Sources" Subje ct: Confirmation of NilY Cr witments llegarding Ilmergency Diesel Generator Testing Gonticmen:

New ilampshire Y a rik c e (NilY) has determined that the testing program for the Seabrook Station timergency Diesel Generators (IIDG) dou not fully meet the intent of flegulatory Positian C.2.a.(5) of lle gulat or y Guide 1.108, " Periodic Testing of Diesel Generator Units Used as Onsite filectrical Power Sptems at Nuclear Power Plants." NilY has also determined that all of the requirements of the esisting Technical Specification 3/4.8.1, 'A.C. Sources

• have been satisfactorily completed and the 1.!DGs are fully operable with no concerns related to safety or to the capability of the liDG6 to perfoam their design lunctions if required to do so.

~

With regard I". the intent of lleg latory Guide 1.108, NilY has not performed a Loss-of Offsite-Power (LOP) Test in conjunction with a Safety injection (SI) Test (TS 4.8.1.1.2f.6)b)) while the EDGs were in a standby condition. NilY utilizes a keep warm system for the liDG jacket coolant and tube oil in the standby condition. NilY has

< performed the LOP /S! Test after completion of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run tett lTS 4.8.1.1.2f.7)], This testing was performed in this sequence based on the guidance provided in Technical Specification 4.8.1.1.2f.7) that states "[w}ithin 5 minutes af ter completing this 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test, pe r f or m Specification 4.8.1.1.2f.6)b)

• NilY believes that this test sequence meets all of the Technical Specification Surveillance Itequirements in addition to minirniving mechanical stress and wear on the EDGs.

NilY has reviewed the current EDG testing program and has determined that the attributes that would have been tested during a standby LOP /SI Test have been verified through other testing conducted in accordance with the Technical Specifications. The EDGs are tested every 18 months during shutdown, to ensure that they will start under various conditions including a LOP [TS 4.8.1.1.2f.4)b)), $1 [TS 4.8.1.1.2f.5)), and an LOP /SI [TS 4.8.1.1.2f 6)). In addition to these three tests, Technical Specification 4,8.1.1.2a.5) requires a monthly test where the EDGs are started from

• ambient

• conditions and are fully loaded within 10 minutes, This delayed loading is to minimize mechanical stress and wear. Ti,is 9204270375 920424 5 PDR ADOCK 05000443 a j 1(\

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c. y r; g o new

' ' nampsruro 'anroe Division of Public Service Company of New Hampshire P.O. Box 300

• Seabrook, NH 03874

• Tel y hone (6ts3) 474 9521 k.

4 i .

United States Nuclear Regulatory Commiuion April 24, IW2 Attention: Document Control Dcd Page two specification also requires that every 184 days the LDGs are started, without the benefit of the normal pre lube operation, and are fully loaded within two minutes. This s apid loading demonstrates the capabibly of the dicsci to accept loads similar to those that would be sequenced on the busses during the initial 120 seconds in an accident scenario.

During all of thes.c tests the critical liDG parametens are monitored and verified to be within acceptable values. These paramcters include the ability to stari and come up to rpeed, required frequency (60 1.2117), required voltage (41601420 Volts) and to maintain the steady state values during the duration of the particular runs. Since the dieseb, are tested from the *a mbient" condition and again from the

• hot

• or normal operating temperature condition, the total realm of potential conditions has been tested.

The results from these tests indicate that there are no significant differences between the testing of the EDGs with an LOP and 1.OP/SI condition. Enclosure I compares the load changes expected during the LOP and LOP /SI tests as derived froin UFSAR, Tables 831 and U-2. It should be noted that with the exception of the fir st two steps in the sequencing, that the kW loads expected from the LOP are either equal to or greater than those expected from the LOP /SI. Enclosure 2 presides a comparison of the maximum load swings for each sequencing step for the LOP and LOP /S! tests that were conducted during iefueling outage number 1 in the Fall of 1991.

New llampshire Yankee has determined that the EDGs are operable based upon the testing that has been performed and based on the fact that every element of the Technical Specifications, as written and read literally, has been performed. NilY also belieses that no additional safety benefit will be realized by performing an additional LOP /S1

• ambient

• test of the EDGs since the plant would be required to be in a cold shutdown condition to perform such a test, Such action would put the plant though an unnecessary cycle. NilY believss that the equivalent testing performed to date and the analysis of the existing test data demanstrates the EDGs are fully operable and that the EDGs will perform their ~

required design functions if they should be called upon to do so.

In order to ensure that ihe intent of Regulatory Guide 1.108 is fully met in future testing, NilY, as discussed in an April 17,1992 teleconference [ Reference (b)}, will perform a test of the EDUs with an LOP /S1 start from the standby condition prior in ascending to MODE 4, the next time the plant enters MODE 5. In addition, NilY will promptly propose a clarification to the existing Seabrooh Station Technical Specification. NilY will provide the clarification by supplementing License Amendment Request 91-10 previously transmitted to the NRC in NilY Letter NYN 42032, dated March 20, 1992.

Should you have any questions regarding this matter please contact Mr. Terry L liarpster, Director of Licensing Services, at (603) 474 9521, extension 2705.

Very truly yours, ,

y4 6V -'

/

Ted C. Feig(nbaum Enclosures

4 United States Nuclear lttrolatory Commission A pril 24,1992 Attention: Document Control l>est Page three cc: hit. Thomas T htariin llegional Administrator U. S. Nuclear 1(egulatory Co:ntnission llegion 1 475 Allendale 1(oad King of Prussia, PA 19406 hir. (iordon li, tidison, Sr. Project blanager Project Directorate 13 Divisior. of lleactor Projects U.S. Nuclent licgulatory Commission Washington, *TC 20$$5 hit. Nivel 1,auley NitC SenNr itesident inspector P.O. llox 11C Seabrook, Nil 03s?4 I

New llamp. hire Yankee April 24,1992

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I ENCLCa.I'RE 1 TO NYN 42054 1

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KW LOAD CilhNGES PER FSAR TABLES 8.3 1 & 8.3-2 TRAIN A TRAIN B p; TIME LOP LOP & SI LOP LOP & SI 12 See 1583 1627 1081 1125 17 Sec .240 638 200 598

~ 22'Sec. 295 295 295 295 27 Sec. 220 0* 220. 0*

32 Sec 649 649 649 649 37 Sec :0 0 0 0

= 42 Sec 0 0 606 606

-47 Sec 107 ~ 0 107 0

- 52 Sec 620 620 620 620 ,

62 Sec. 317 317' 308 308 72 Sec 275- 275- 0 0 120 Sec '754 708 462 416

• - _ Containment spray pump load of 412 KW not included since it does not sequence on during SI test.

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I New llampshire ' Yankee April 24,1992 ,i r

t ENCI.OSURE 2 TO NYN-92054 0

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TEST EX1804.001 - COMPLETED 10/04/91 DIESEL A EVENT 5 HOT ENGINE LOP SI EVENT 4 AMBIENT ENGINE LOP VOLT Dh0P FRE0 DRCP (HZ)

TIME STEP KW CHANGE (PEAK) VOLT DROP FREQ DROP (HZ) KW CHANGE (PEAK)'

3760

• N/A 1960 3770

• N/A 12 sec. 0 1960

.1 2030 (1) 280 .2 .__

17 sec. 1 700 90

.1 490 140 .1 22 sec. 2 490 120-0 0 945 (2) 130 .2 0 27 sec. 3

.2 1400 260 .3 32 sec. 4 1400 250 0 0 0 0 0 0 37 sec. 5 0 0 0 0 0 0 42 rec. 6 l 0 0 9 47 sec. 7 420 (3) 60 ' .1

.1 1260 I 240 .4 52 , . 8 1225 210 0 0 0 0 0 0 62 sec. 9 0 0 0 0 0 0 72 sec. 10

.1 1050 100 .2 1120 100 120 sec. 11 1 (1) Safety injection pump start.

(2) Containment structure _coling fan start.

(3) Containraent structure ceoling fan start.

• Voltage at breaker closure.

' TEST EX1804.015 - COMPLF.TED 10/02/91 j

DIESEL B -

EVENT:4 AMBIENTLENGINE LOP EVENT.5 HOT ENGINE LOP SI  :

~

TIME  : STEP KW CHANGE (PEAK) VOLT DROP l- EREQ DROP (HZ) KW CHANGE (PEAK) V0LT DROP FREQ DROP (HZ)

12.sec. 0 ~2100 3840 *- N/A 1890 3840

• N/A 17 sec. 1 630 100 .2 1890 (1) 280 .2 22 sec. :2-. 350 ,

120 ,

.1-- 490 160 0  :

7' sec. 3 840 (2)- 140 .2 0 0 0 i i

.2

.2-260 i 32 sec. '4: 1120 300 1260 l

0 0 0 0  !

37 sec. - 5 ~. 0 0 42 sec. 6;. 1960- 320- .4 1820 320 .2- [

t 47 sec. 7' 350.(3) 80 .1 0 0 0 [

52 sec. 8- 1190- 280 .2 1190 240 .2 1

62 sec. 9 -0 0 0 0 0 0 r 1

72 sec. 10- 0 0 0 0 0 0 i 120 sec. '11- 630 60  ; .1 630 80 .05  :

-[

4

'(1) Safety injection pump start. ..

(2) Containment structure cooling fan start. i (3):-Containment structure cooling fan start.  ;

• Voltage-at~ breaker closure.

t i

6

~

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