ML20195C946

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Proposed Tech Specs,Clarifying Operability Requirements for Pressurizer Heaters & Emergency Power Source for Pressurizer Heaters
ML20195C946
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 11/10/1998
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20195C936 List:
References
NUDOCS 9811170245
Download: ML20195C946 (11)
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o 6401 a REACTOR COOLANT SYSTEM PRESSURIZER LIMITING CONDITION FOR OPERATION

! 3.4.4 The pressurizer shall be OPERABLE with :t h::t 25 b ef ; :: eM:e {

hee 4ees,and a water volume of less than or e al to 12 _

we$wts.b W iwbab<sC O M""N APPLICABILITY: MODES 1, 2 and 3. +t.. q.aq ,4 a .(3,.q b (IN a.d capti

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ACTION: a s,.cias.a e%.q e. _

a. With the pre;;uri;er inep;r;ti; i.; t; en inep;reti; ;;;r;;n;y pa-;-

_ ;;!y f;r th: pr;;;;rh;r 5::t:r: ;ith;r r;;t;r; th; inep;reti;- t zr;;n;y ;;r;r ::;;1y 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 i 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. y

b. With the pressurizer othemise inoperable, be in at least HOT STANDBY f with the reactor trip breakers open 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 />.

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I SURVEILLANCE REQUIREMENTS

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4.4.4.1 The pressurizer water volume shall be determined to be within its <

limit at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. /%

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l 9811170245 981110' PDR ADOCK 05000338 P PDR NORTH ANNA - UNIT 1 3/4 4-8 Amendment No. af-l

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i North Anna Power Station Units 1 and 2 Virginia Electric and Power Company

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l e-21-30 c-REACTOR COOLANT SYSTEM PRESSURIZER .

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I'IMITING CONDITION FOR OPERATION l l

3.4.4 The pressurizer shall be OPERABLE with :: b=: 125 hw ef p==:d= h= ::; and a water volume of less than or equal to 1240 cubic feet. W' *I r 5" h"** NN wm w c4g ..ry .c.uk4 q ,= 4 A

  • *1=<f fo 82 sw.as ud up.h .1 W., 7 APPLICABILITY: MODES 1,2 and 3. ,%,,,4 4 , u o,,,,,;,s .g q ACTION: [* _f-
a. Wi t p== -i=r i=p =bb *e *^ = bep nb!::=: gery per::::pply fc

-.: p== d=:h=== :!S- r'e= h ber@le - eegeacy p=er sypp!y 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 />. l

b. With the pressurizer otherwise inoperable, be in at least HOT STANDBY with the reactor trip breakers open 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 />.
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l SURVElLLANCE REQUIREMENTS (

l 4.4.4.1 The pressurizer water volume shall be determined to be within its limit at least once per )

i 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

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NORTH ANNA - UNIT 2 3/44-8 4 + u 1"<d

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l Attachment 3 '

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! Proposed Technical Specifications Changes l.

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North Anna Power Station

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Unit 1

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North Anna Power Station

Units 1 and 2 l . Virginia Electric and Power Company

REACTOR COOLANT SYSTEM PRESSURIZER LIMIIING CONDITION FOR OPERATION 3.4.4 The pressurizer shall be OPERABLE with two groups of pressurizer heaters OPERABLE with the capacity ofeach group greater than or equal to 125 kW and capable of being powered from its associated emergency bus, and a water volume of less than or equal to 1240 cubic feet.

APPLICABILITY: MODES 1,2 and 3.

ACTION:

a. With one required group of pressurizer heaters inoperable, restore the required group of pressurizer heaters 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 the pressurizer otherwise inoperable, be in at least HOT STANDBY with the reactor trip breakers open 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 />.

SURVEILLANCE REQUIREMENTS .

4.4.4.1 The pressurizer water volume shall be determined to be within its limit at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

NORTH ANNA - UNIT 1 3/4 4-8 Amendment No. 33,

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North Anna Power Station

! Units 1 and 2 L'

Virginia Electric and Power Company J

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. . . . . - . . - _. - . . - _ - - - . . . . . . . . - - . - . . - . ~ . . _ . - . -

REACTOR COOLANT SYSTEM

[ PRESSURIZER LIMITING CONDITION FOR OPERATION 3.4.4 . The pressurizer shall be OPERABLE with two groups of pressurizer heaters OPERABLE i with the capacity of each group greater than or equal to 125 kW and capable of being powered from

' its associated emergency bus, and a water volume ofless than or equal to 1240 cubic feet, j l.

! APPLICABILITY: MODES 1,2 and 3.

l l ACTION:

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a. With one required group of pressurizer heaters inoperable, restore the required group i of pressurizer heaters 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 I 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  !

hours.

I b. With the pressurizer otherwise inoperable, be in at least HOT STANDBY with the

! reactor trip breakers open 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 1 following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

,. SURVEILLANCE REQUIREMENTS l

4.4.4.1 The pressurizer water volume shall be determined to be within its limit at least once per L 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

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l NORTH ANNA - UNIT 2 3/4 4 8 Amendment No.

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Attachment 4

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l Significant Hazards Consideration Determination l

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l North Anna Power Station Units 1 and 2 Virginia Electric and Power Company l

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! SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION I

\/irginia' Electric and Power Company has reviewed the requirements of 10 CFR 50.92 as they relate to the proposed changes for the North Anna Units 1 and 2 and determined that a significant hazards consideration is not involved. The proposed I changes will revise the LCO 3.4.4 to require that the pressurizer have two groups of pressurizer heaters operable with a capacity of greater than or equal to 125 kW and capable of being powered from its associated emergency bus. The Action Statement will also be revised to focus on heater operability. The following is provided to support this conclusion.

i a) Does the change involve a significant increase in the probability or consequences of an accident previously evaluated?

! The pressurizer heaters are not an initiator of any accident previously l evaluated. As a result, the probability of any accident previously evaluated is

not increased. The pressurizer heaters remain operable as assumed in the accident analysis to mitigate the consequences of any accident. Therefore, the proposed changes to clarify the operability requirements do not significantly increase the probability of occurrence or the consequences of any previously analyzed accident.

, b) Does the change create the possibility of a new or different kind of accident l from any accident previously evaluated?

l l The proposed Technical Specifications changes do not involve any physical

! alteration of the plant or changes in methods governing normal plant operation.

Operation of and the design of the pressurizer heaters and the associated power supplies are not changed by the proposed changes. The proposed changes do not impose any new or eliminate any existing requirements.

l Therefore, it is concluded that no new or different kind of accident or l malfunction from any previously evaluated has been created.

c) Does the change involve a significant reduction in a margin of safety?

The proposed Technical Specifications changes will not reduce the margin of safety since the change has no effect on any safety analyses assumptions.

l The pressurizer heaters remain operable as assumed in the safety analysis to mitigate the consequences of any accident previously analyzed. The proposed changes only clarify the operability requirements for the pressurizer heaters and associated emergency power supplies. Therefore, the proposed changes do not result in a significant reduction in a margin of safety.

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.The above demonstrates that the proposed amendment to the North Anna Units 1 and  ;

2, Tech.nical Specifications does not involve a significant incruse in the probability or consequences of a previously evaluated accident, does not cieate the possibility of a new or different kind of accident and does not involve a significant reduction in a margin of safety.

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