ML20238B436

Proposed Tech Specs,Revising Min Flow & Pressure Requirements for High Pressure Fire Protection Sys at Plant

ML20238B436
Person / Time
Site:	Sequoyah
Issue date:	07/02/1987
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20238B430	List: ML20238B428 ML20238B436
References
TAC-R00193, TAC-R00194, TAC-R193, TAC-R194, NUDOCS 8709010215
Download: ML20238B436 (28)

Text

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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-87-26)

PROPOSED REVISION OF THE MINIMUM FLOW AND l

PRESSURE REQUIREMENTS FOR THE HICH-PRESSURE FIRE PROTECTION SYSTEM LIST OF AFFECTED PAGES Unit 1 3/4 7-31 3/4 7-32 Unit 2 3/4 7-43 3/4 7-44 P

l l

PLANT SYSTEMS 3/4.7.11 FIRE SUPPRESSION SYSTEMS FIRE SUPPRESSION WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.11.1 The fire suppression water system shall be OPERABLE with: {

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a. Two fire suppression pumps, each with a capacity of ++7+ gpm, with their discharge aligned to the fire suppression header,

b. An OPERABLE flow path capable of taking suction f rom the forebay and transferring the water through distribution piping with OPERABLE sectionalizing control or isolation valves to the yard hydrant curb valves, the last valve ahead of the water pressure alarm device on '

each sprinkler or hose standpipe, and the last valve ahead of the deluge valve on each deluge or spray system required to be OPERABLE

, per Specifications 3.7.11.2 and 3.7.11.4. .

APPLICABILITY: At all times.

ACTION:

a. With only one pump OPERABLE. restore the' inoperable equipment to OPERABLE status within 7 days or, in lieu of any other report required by Specification 6.6.1, prepare and submit a Special Report to the lR40 Commission pursuant to Specification 6.9.2 within the next 30 days outlining the plans and procedures to be used to restore the inoperable equipment to OPERABLE status or to provide an alternate backup pump or supply. The provisions of Specifications 3.0.3 and 3.0.4 are not applicable.

b. With' the fire suppression water system otherwise inoperable:  !

1. Establish a backup fire suppression water system within 24  !

hours, and

2. In lieu of any other report required by Specification 6.6.1, submit a Special Report in accordance with Specification 6.9.2: {04 0 a) By telephone within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, I i

b) Confirmed by telegraph, mailgram or facsimile transmission l no later than the first working day following the event, and

~

+-v w w .u w w . y SEQUOYAH - UNIT 1 3/4 7-31 *

~

PLANT SYSTEMS ACTION: (Continued) c) In writing within 14 days following the event, outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE l status.

SURVEILLANCE REQUIREMENTS 4.7.11.1 The fire suppression water system shall be demonstrated OPERABLE: I

a. At least once per 31 days on a STAGGERED TEST BASIS by starting each electric motor driven pump and operating it for at least 15 minutes on recirculation flow,

b. At least once per 31 days by verifying that each valve (manual, '

power operated or automatic) in the flow path is in its correct position. I

• c. At least once per 6 months by performance of a system flush. R17

d. At least once per 12 months by cycling each testable valve in the flow path through at least one complete cycle of full travel. '

e. At least once per 18 months by performing a system functional test which includes simulated automatic actuation of the system throughout its operating sequence, and:

1. Verifying that each automatic valve in the flow path actuates to its correct position, l 2. Verifying that each pump develops at least MM gpm at a system head of -}M- feet, 338

3. Cycling each valve in ,the flow path that is not testable during plant operation through at least one complete cycle of full j travel, and

4. Verifying that the No. 1 fire pump starts to maintain the fire suppression water system pressure greater than or equal to 125 psig and that the No. 2 fire pump also starts automatically within 10 + 2 seconds when the fire suppression water system is l not maintaTned greater than or equal to 125 psig by the No. 1 pump.

f. At least once per 3 years by performing a flow test of the system in accordance with Chapter 5, Section 11 of the Fire Protection Handbook, 14th Edition, published by the National Fire Protection Association.

• Note: These flushes should coincide with the chlorination of the raw service and fire suppression water system. These flushes should R17 be run, one between April 1 and June 30, and the other between September 1 and November 15.

Within the prescribed spring and fall test period, deviation from .

the six-month performance frequency is authorized.

ygj 4 W l i

SEOUOYAH - UNIT 1 3/4 7- 32 ninenumenu hu- d l

1

. 1

- PLANT SYSTEMS 3/4.7.11 FIRE SUPPRESSION SYSTEMS FIRE SUPPRESSION WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.11.1 The fire suppression water system shall be OPERABLE with:

/Gr3 _ )

a. Two fire suppression pumps, each with a capacity of -14M gpm, i with their discharge aligned to the fire suppression header, and  !

b. An OPERABLE flow path capable of taking suction f rom the forebay t and transferring the water through distribution piping with OPERABLE )

sectionalizing control or isolation valves to the yard hydrant curb l valves, the last valve ahead of the water press,ure alarm device on 1 each sprinkler or hose standpipe, and the last valve ahead of the deluge valve on each deluge or spray system required to be OPERABLE i per Specifications 3.7.11.2 and 3.7.11.4.

APPLICABILITY: At all times. I l

ACTION:

(h a. With only one pump OPERABLE restore the inoperable equipment to j 0PERABLE status within 7 days or, in lieu of any other report j required by Specification 6.6.1, prepare and submit a Special l R2 {

Report to the Commission pursuant to Specification 6.9.2 within I the next 30 days outlining the plans and procedures to be used to restore the inoperable equipment to OPERABLE status or to provide an alternate backup pump or supply. The provisions of 1 Specifications 3.0.3 and 3.0.4 are not applicable. 1

b. With the fire suppression water system otherwise inoperable:

1. Establish a backup fire suppression water system within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and

2. In lieu of any other report required by Specification 6.9.1, submit a Special Report in accordance with Specification 6.9.2:

a) By telephone within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, b) Confirmed by telegraph, mailgram or facsimile transmission no later than the first working day following the event, and

,--w-,,w, - .

y --

SEQUOYAH - UNIT 2 3/4 7-43 ^ 2 ..

r

i

^

PLANT SYSTEMS ACTIOh: (Continued) c) In writing within 14 days following the event, outlining the action teken, the cause of the inoperability and the plans j and schedule for restoring the system to OPERABLE status.

SURVEILLANCE REQUIREMENTS l I

l 4.7.11.1 The fire suppression water system shall be demonstrated OPERABLE:

a. At least once per 31 days on a STAGGERED TEST BASIS by starting each electric motor driven pump and operating it for at least 15 minutes on recirculation flow,

b. At least once per 31 days by verifying that each valve (manual, power operated or automatic) in the flow path is in its correct position.  !

R4

• c. At least once per 6 months by performance of a system flush.

i

d. At least once per 12 months by cycling each testable valve in the flow path through at least one complete cycle of full travel. >

e. At least once per 18 months by performing a system functional test ~

l which includes simulated automatic actuation of the system throughout j its operating sequence, and:

1. Verifying that each automatic valve in the flow path actuates to its correct position, )

1653 l

2. Verifying that each pump develops at least -1+74 gpm at a i system head of ele feet, l 338' i

3. Cycling each valve in the flow path that is not testable during '

plant operation through at least one complete cycle of full travel, and

4. Verifying that the No. 1 fire pump starts to maintain the fire )

suppression water system pressure greater than or equal to 125 psig, and that the No. 2 fire pump starts automatically within 10 1 2 seconds if the fire suppression water system is not maintained at greater than or equal to 125 psig by the No. 1 pump.

f. At least once per 3 years by performing a flow test of the system in accordance with Chapter 5, Section 11 of the Fire Protection Handbook, 14th Edition, published by the National Fire Protection Association.

• Note: These flushes should coincide with the chlorination of the raw service and fire suppression water system. These flushes should be run, one between April 1 and June 30, and the other between September 1 and -

R4 November 15.

Within the prescribed spring and fall test period, deviation from the six-month performance frequency is authorized.

SEQUOYAH - UNIT 2 3/4 7-44 M i *.302

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1 l

l ENCLOSURE 2 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-87-26) l DESCRIPTION AND JUSTIFICATION FOR PROPOSED REVISION OF THE MINIMUM FLOW AND PRESSURE REQUIREMENTS FOR THE HIGH-PRESSURE FIRE PROTECTION SYSTEM i

ENCLOSURE 2 Description of Change The minimum acceptable flow capacity of 1,174 gpm for each High-Pressure Fire l Protection System (HPFPS) pump given in Liniting Condition for Operation (LCO) j 3.7.11.1.a of the Sequoyah units 1 and 2 technical specifications is revised l to 1,653 gpm. Also, the minimum acceptable flow and pressure requirements of l 1,174 gpm at a system head of 312 feet as stated in the associated surveillance requirement, (SR) 4.7.11.1.e.2, are revised to 1,653 gpm at a system head of 338 feet.  ;

i Reason for Change l j

l As a result of the physical walkdown of the fire protection system at Sequoyah l to ensure Appendix R compliance, it was necessary to modify the layout of the sprinkler system and to install additional piping to supply some hydraulically remote areas. These modifications affected the flow requirements and system resistance of the HPFPS. Consequently,'the minimum flow and head requirements stated in the technical specifications needed to be raised to ensure that the HFFPS capacity was adequate for meeting the most demanding safety-related fire condition.  !

Justification for Change TVA's Division of Nuclear Engineering (DNE) has updated the capacity requirements of the HPFPS as a result of recent system modifications to ensure Appendix R compliance. The new capacity requirements are based on certified pump test curves and a recent DNE calculation that account for the present HPFPS configuration. The proposed capacity values will ensure that the HPFP pumps can provide the necessary flow for the most demanding safety-related fire condition as documented by the DNE calculation.

A copy of the pump head and flow calculation is included as an attachment to this enclosure. This copy of the calculation was made from the TVA microfilm system, which serves as the permanent quality assurance record storage system. The calculation determines the pump flow and head requirements based on overall system design and end use water delivery requirements that come from the Appendix R fire analysis. The calculation demonstrates that a margin of at 1 cast 10 percent exists based on the manuf acturer's certified pump curve, t

Attachment SQN-RF-D053 (B44 870424 002)

_ _ _ _ _ _ _ _ _ _ _ - - - - _ - - - - - - - - - 1

TVA 10697 (DNE 646) DNE CALCULATIONS TITLE PLANT / UNIT SON-IHF 9 LLb5 %ni'c M.'o bn Gm.1 and 4w kto d%( dh) /L k s io y ~ ~

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PREPARING ORGANIZATION KEY NOUNS (Conlult RifAS DESCRIPTOFfS LIST) ~

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DRANCH/PROJECIIDENTIFIERS Each time these calculations are issued, preparers must ensure that the original (RO) RIMS eccession 6o N - R F -0053 ,,,, g , y s . ,,,3 g , y 3 ,,,,,, ,,, ,, ,,,,,

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B44 '870424 0 02 l APPLICABLE DESIGN DOCUMENT (S)

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Abstract These calculations contain an unverified assurnptiop(s) that must be verified later. Yes O No O o CS

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1 I

l ENCLOSURE 3 j a

PROPOSED TECHNICAL SPECIFICATION CHANGES SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 )

l DOCKET NOS. 50-327 AND 50-328 q l

(TVA-SQN-TS-87-26)  !

DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATIONS FOR THE PROPOSED REVISION OF THE MINIMUM FLOW AND PRESSURE REQUIREMENTS FOR THE HIGH-PRESSURE FIRE PROTECTION SYSTEM i

f i

i 1

l l

1 i

I

. 1 ENCLOSURE 3 SIGNIFICANT RAZARDS CONSIDERATIONS l

)

d

1. Is the probability of an occurrence or the consequences of an accident  !

previously evaluated in the safety analysis report significantly increased? i l

No. The probability of the occurrence of an accident is not increased.  !

The function of the High-Pressure Fire Protection System (HPFPS) is to minimize the consequences of onsite fires. This change will ensure that the capacity of the HPFPS is adequate for the most demanding safety-related fire conditior

2. Is the possibility for an accident of a new or different type than evaluated previously in the safety analysis report created? i l

No. The proposed change will not create a new or different type of l accident. While the proposed change does raise the minimum acceptable flow and head requirements for the HPFPS pumps, these requirements do not j exceed the design capabilities of the HPFPS.

3. Is the margin of safety significantly reduced?

No. The margin of safety is not changed. The hydraulic requirements of the HPFPS increased because of some modifications and additions to the sprinkler system. Consequently, the minimum technical specification requirements for the HPFPS pumps are being raised to ensure that the previously existing margin of safety is not reduced.