ML20065N223

Proposed Tech Spec Sections 4.8.1.1.2a(4)(b) & (C)

ML20065N223
Person / Time
Site:	Comanche Peak
Issue date:	12/05/1990
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20065N209	List: ML20065N205 ML20065N223
References
NUDOCS 9012120025
Download: ML20065N223 (3)

Text

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LAttechment 3tto TXX-901035 Page : 11o f. 2 ELECTRICAL DC'aE: 5vS'E*5 LIM 111NG CONDIT!ON FOR OPERATION ACTICN (Continued)1

-offsite source restored, restore at least two offsite circuits to ODERAELE: 5titus within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at

.least MOT 57ANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> anc in COLD SHUTDOWN aitnin tne following 30 nours.

f. With two of the above required diesel generators inoperable, cemonstrate the OPERABillit of two offsite A.C. circuits by performing Surveil-lance Reautrement 4.8.1.1.la, within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per S hours thereafter; restore at least one of the inoperable diesel-gener-ators to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore at'least two diesel-generators to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at'least HOT STANDBY within s

l the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, SURVEILLANCE REQUIREMENTS 4.B.1.1.1 Each of tne above. required independent circuits between the of fsite transmission network and the Onsite Class 1E Distribution System-shall oe:

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a. Determined OPERABLE at least once per 7 days by verifying correct ,

creaker al_ignments, indicated power availability, and b, Demonstrated OPERABLE at least orice per 18 ,ths during shutcown by transferring.(manually and automatically) t + 6.9 kV safeguarcs Dus l power supply from.the preferred offsite sou";e to'the alternate effsite scurce.

L 4.5.1.1'.2. Each diesei generator shall be demonstratec OPERABLE:

i ta.. I'n accordance .ith the frequency specified in Table 4.8-1 on a g -STAGGEREC 'EST BASIS by:

l') Ver '3 i ng the fuel level in the cay fuel tank, d

2) Verifying the fuel level in the fuel storage tank, L 3) Verifying the fuel transfer pump starts and transfers fuel from l the. Storage system _to the day fuel tank, 4)- Verifying the-diesel starts from ambient condition:and acceler-ates-to at least 441 rpm in less than or equal to 10 seconds.* t All'olanned diesel engine starts for the purpose of this surveillance may be

' preceded by a preluce period in accordance with vendor recommendations.

COMANCHE PEAK - UNIT'1 3/4 8-3 9012120025 901205 PDR ADOCK 05000445 p PDC

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Attachment 3 to TXX- 901035 Page 2 of 2 ELECTRICAL DOWER SYSTEMS SURVEILLANCEREQUIREMENTS(Continuec)

The generator voltage and frequency shall ce 6900 : 690 veits and 60 1 1.2 Hz within 10 seconcs after tne start signal ** The diesel generator snall ce startea for this test ey using one of the following signals:

a) Manual, cr t) Ster t up t r3 %4rmeMe<4NW-y--w+nd&ng-tinosthgeM es 5 i mv i et+d-4es s - O f perfmed c f f 3 ite-powee- W4+44, y Q b [ Simulated safeguaras bus undervoltage, or c,_ ,e( Safety Injection Actuation test signal in conjunction with loss of preferred offsite power, or cl [ Safety Injection Actuation test signal by itself.

5) Verifying the generator is synchronized, loaded to detween 6,300 and 7,000 kW and operates at this load condition for at least 60 minutes, and

6) Verifying the diesel generator is aligned to provice stanc::. ,

power to the associated emergency busses,

b. At least once per 31 days and after each ope stion of the dieset where the period of operation was greater t- n or equal to 1 nour by checking for and removing accumulated water "om the day fuel tank;

c. At least once per 31 days by checking for a removing accumulatec

.ater from the fuel oil storage tanks;

c. By sampling new fuel oil in accordance with ASTM-04057-19El orier to addition to storage tanks and:

1) By verifying in accordance with the tests soecifiec in aETM-0975-1981 prior to addition to tne storage tanks that ne sample has:

• 0iesel generator loading for the purpose of this surveillance may De accomolished in accordance with vendor recommendations; i.e., >110 seconds.

• • During performance of surveillance activities as a requirement for ACT'CN statements, the air-roll test shall not be performed.

This cand is meant as guidance to avoid routine overloading of ciesel generator. Momentary load excursions outside this band due to changing cus loads shall not invalidate the test.

COMANCHE PEAK - UNIT 1 3/4 S-4

Attachpent 4 to TXX 901035 i P, age *1 of 1 -DETAILED DESCR!PTION

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Page (n tegndgd) Group Description 3/4 8 5 3 Removal of duplicate diesel generator start signal.

Correction:

Deletes start-up transformer secondary winding under-voltage as a diesel generator start signal since this signal and the loss of preferred of f site power signal are initiated by the same undervoltage relay.

See description below for the deletion of the loss of preferred offsite power source diesel start signal (TS 90 020).

FSAR Change Request Number: TS 89 099 Related SER Section: 8.3.1: SSER22 8.3.1 SER/SSER Impact: No 3/4 8 5 2 Revises diesel generator start logic to prevent start on loss of preferred offsite power with alternate offsite power available and supplying power to Class 1E buses.

Revision:

. On a loss of the preferred power source, if the alter-nate power source is available and powers the Class 1E buses, the diesel generator will now not start. This design modiff'.e, ion prevents unnecessary starts of the diesel generators when they are not needed. The relay logic was changed by removing 27AX-2/ST2, which started the diesel generators on a loss of preferred offsite power, and ren.oving the start signal from 27-2X/1EA1 and replacing it with a new time delay relay. 272X-1/

1EA1. The new time delay relay has a delay of 1.0 sec.

to allow time for the alternate offsite power source breaker to close and power the bus. If the alternate offsite power source does not energize the bus, then the diesel generator starts and powers the Class 1E buses. This design modification does not affect the start of a diesel generator on a safety injection signal. A safety injection signal still immediately starts the diesel generator. The time delay selected for the new relay remains within the allowance made for relay operation for starting the diesel generator and powering loads used in the accident analysis in Chapter Chapter 15 of the FSAR.

FSAR Change Request Number: TS-90 020 Related SER Section: 8.3.1: SSER22 8.3.1 SER/SSER Impact: Yes SSER 22 Section 8.3.1 states that the diesel generator will start on undervoltage on the loss of the preferred offsite source.

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