ML20045F777

Proposed Tech Specs SR 4.7.1.2 for Performance of Turbine Driven EFW Pump Surveillance Test at Secondary Steam Pressure Greater than or Equal to 865 Psig

ML20045F777
Person / Time
Site:	Summer
Issue date:	06/30/1993
From:	SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20045F776	List: ML20045F775 ML20045F777
References
NUDOCS 9307080395
Download: ML20045F777 (5)

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l Enclosure 1 to Document Control Desk letter i TSP 930009 Page 1 of 1 l PROPOSED TECHNICAL SPECIFICATION CHANGE - TSP 930009  ;

VIRGIL C. SUMMER NUCLEAR STATION LIST OF AFFECTED PAGES AND DESCRIPTION OF CHANGES i i

Page Specification Description of Change >

3/4 7-4 4.7.1.2 Changed the secondary steam supply  ;

pressure to 865 psig .

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9307080395 930630 5 PDR ADDCK.05000

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PLAMT SYSTEMS ENERGEMCY PEEDWATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.1.2 At least three independent steam generator emergency feedwater pumps and flow paths shall be OPERABLE with:

a. Two motor-driven emergency feedwater pumps, each capable of being powered from separate emergency cusses, ar,d D. One steam tureine driven emergency feedvater pump capaDie of being powered from an OPERABLE steam supply system.

APPLICABILITY: MODES 1, 2 and 3.

ACTICW:

a. With one emergency feedwater pump inoperable, restore the required emergency feedwater pumps to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 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 HOT SHUTDOWN i

within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

b. With two emergency feedwater pumps inoperable,be in at least HOT STANDBY vithin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

c, With three emergency feedwater pumps inoperable, immediately initiate corrective action to restore at least one emergency feedwater pump to OPERABLE status as soon as possible.

SURVEILLANCE REQUIREMENTS 4.7.1.2 Each emergency feedwater pump shall be demonstrated OPERABLE:

a. At least once per 31 days by:

1. Verifying that each motor driven pump develops a discharge pressure greater than or equal to 1600 psig at greater than or equal to 90 gpa flow.

2. Verifying that the steam turbine driven pump develops a discharge pressure greater than or equal to 1330 psig at a  ;

flow greater than or equal to 97 gpa when the secondary steam l supply pressure is greater than Jog;psig. The provisions of Specification 4.0.4 are not applicable.

3.

%S Verifying that each non-automatic valve in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position.

SUMMER - UNIT 1 3/4 7-4 ACendCODt NO. 112 l

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i PLANT SYSTEMS i EHERGENCY FEEDWATER SYSTEM LIMITING CONDITION FOR OPERATION 3 7.1.2 At least three independent steam generator emergency feedwater pumps and flow paths shall be OPERABLE with:  ;

a. Two motor-driven emergency feedwater pumps, each capable of being  ;

powered from separate emergency busses, and

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b. One steam turbine driven emergency feedwater pump capable of being  :

powered from an OPERABLE steam supply system.  :

APPLICABILITY: MODES 1, 2 and 3. r ACTION: l

a. With one emergency feedwater pump inoperable, restore the required emergency feedwater pumps to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 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 HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />,

b. With two emergency feedwater pumps inoperable, be in at least HOT  :

STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

c. With three emergency feedwater pumps inoperable, immediately  !

initiate corrective action to restore at least one emergency i feedwater pump to OPERABLE status as soon as possible.

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SURVEILLANCE REOUIREMENTS  ;

4.7.1.2 Each emergency feedwater pump shall be demonstrated OPERABLE: i

a. At least once per 31 days by:

1. Verifying that each motor driven pump develops a discharge -

pressure of greater than or equal to 1600 psig at greater than or equal to 90 gpm flow.

2. Verifying that the steam turbine driven pump develops a j discharge pressure of greater than or equal to 1330 psig at a flow of greater than or equal to 97 gpm when the secondary i steam supply pressure is greater than 865 psig. The provisions l  ;

of Specification 4.0.4 are not applicable. l

3. Verifying that each non-automatic valve in the flow path that i is not locked, sealed, or otherwise secured in position, is in .

its correct position.  ;

l SUMMER - UNIT 1 3/4 7-4 Amendment No.

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Enclosure 2 to Document Control Desk Letter TSP 930009 Page 1 of 1 PROPOSED TECHNICAL SPECIFICATION CHANGE - TSP 930009 ,

VIRGIL C. SUMMER NUCLEAR STATION l DESCRIPTION AND SAFETY EVALUATION DESCRIPTION OF AMENDMENT REQUEST SCE&G proposes to modify the VCSNS TS, Section 4.7.1.2, to perform the I turbine driven EFW pump (EFWP) surveillance test at secondary steam pressure greater than or equal to 865 psig. ,

SAFETY EVALUATION The proposed change to the secondary steam pressure required to test the turbine driven EFWP reflects the results of the analysis performed in support of the license amendment to increase the plugging margin of the steam '

generators, which was approved and issued as Amendment No. 111 on March 18, 1993. After increasing the tube plugging in the steam generator during last refueling outage, the main steam pressure at full power has decreased below the 900 psig required for testing as required by existing surveillance '

requirement 4.7.1.2. This condition was expected as stated above. 1 The proposed request to test the turbine driven EFWP at secondary steam pressure equal to or greater than 865 psig continues to provide conservative and adequate margin to ensure pump capability.

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= , a, Enclosure 3 to Document Control Desk Letter TSP 930009 Page 1 of 1 PROPOSED TECHNICAL SPECIFICATION CHANGE - TSP 930009 VIRGIL C. SUMMER NUCLEAR STATION DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATION DESCRIPTION OF AMENDMENT REQUEST SCE&G proposes to modify the VCSNS TS, Section 4.7.1.2, to perform the turbine driven EFW pump (EFWP) surveillance test at secondary steam pressure greater than or equal to 865 psig.

BASIS FOR DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATION SCE&G has evaluated the proposed TS change and has determined that it does not represent a significant hazards consideration, based on the criteria established in 10CFR50.92(c). Operation of VCSNS in accordance with the proposed action will not:

(1) Involve a significant increase in the probability or the consequences of an accident previously evaluated.

The proposed amendment changes the test' conditions for which surveillance Requirement 4.7.1.2.a.2 is performed and proposes no other significant change to the subject surveillance. Testing .

the turbine-driven emergency feedwater pump at a steam pressure below 900 psig does not adversely affect either the availability or the functional performance of the emergency feedwater system.

At the proposed steam pressure, the EFW pump remains capable of-developing sufficient brake horsepower to develop full operating conditions. As such, the proposed testing adequately demonstrates ,

the functional performance of the turbine-driven emergency feedwater pump.

(2) Create the possibility of a new or different kind of accident from any previously analyzed.

The proposed revised testing does not affect the emergency feed-water system initiation, system response time, or system functional performance. The proposed amendment changes the test conditions under which the turbine-driven emergency _feedwater pump will be tested and does not involve physical changes to the emergency feedwater system. As such, new or different accidents are not created.

(3) Involve a significant reduction in a margin of safety.

The functional performance of the emergency feedwater system functional performance is not changed as a result of the revised testing. As such, current margins of safety are maintained.