ML20107E660

Proposed Tech Spec 4.2 Re Primary Coolant Sys

ML20107E660
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/06/1985
From:	PUBLIC SERVICE CO. OF COLORADO
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ML20107E643	List: ML20107E660
References
NUDOCS 8502250709
Download: ML20107E660 (16)

Text

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2 4.2 PRIMARY COOLANT SYSTEM - LIMITING CONDITIONS FOR OPERATION l These specifications apply to the configuration l and characteristics of the primary (helium) reactor l coolant system excluding the steam generators-which l are included in Section 4.3.

OBJECTIVE

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l To ensure the' capability to cool the reactor g l core and to preserve the integrity of the. fission l product barriers, by defining the minimum 0PERABLE

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l equipment of the primary reactor coolant Lsystem and l its~ characteristics.

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Fort St. Vrain r Technical Specifications Amendment No.

Page 4.2-2 1

4 l Specification LCO 4.2.1 -

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2-2a l Specification LCO 4.2.1.1 - Number of OPERABLE l Circulators - POWER OPERATION l Limiting Conditions for Operation l There shall be at least one OPERABLE circulator l in each loop.

l APPLICABILITY: POWER OPERATION l ' ACTION l a) With both circulators in a loop

-l inoperable, the reactor shall.beI n-LOW i l POWER or... SHUTDOWN within'(24) hours, l and remain in'that condition -until.,'at l 'least one circulator .in that' loop ca'n _

l be restcred to an OPERABLE status, y

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~l 'b)With only.one.. of 'four circulators.

'l OPJRABLE, the reactor shall' be' 'inDLOW - 0 l  ; POWER 'or SHUTDOWN within'the nexti(6) l hours.-

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Fort St. Vrain i

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Technical Specifications Amendment-No.

Page 4.2-2b l NOTE: A circulator shall be considered l OPERABLE if the following conditions or

.l system requirements are met for that l circulator:

l 1. Emergency Feedwater and , Boosted l Firewater are' available to drive

~l the water turbine and capability l- for turbine water drainage- exists.

l The Emergency-_FeedwaterL. Header,

. l~ Emergency Condensate Header, or:

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both Emergency Water Booster pumps

'l may be inoperablec:fori up' to' 24 l hours ~without, the helium. circulator l .being' considered inoperable.

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2-2c l 2. The normal bearing water system is l OPERABLE.

l 3. The associated bearing water l accumulator system is OPERABLE.

l 4. Both Bearing Water Makeup Pumps are l OPERABLE to provide required makeup l water. One of the bearing water l' makeup pumps may be inoperable for l 24 hours ~ without the. helium l circulators being considered l . inoperable.

l SURVEILLANCE REQUIREMENT.(s): 5.2.7, -5.2.8, 5.2.9, l 5.2.23.

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2-2d l Basis For Specification LCO 4.2.1.1 l The requirements for an OPERABLE circulator l specified above provide for adequate circulator l water turbine supply and circulator auxiliary l supplies to assure safe shutdown cooling.

l Each independent bearing water system provides a

, l continuous supply of bearing water to the two l circulators in each primary cooling loop. In l addition, two gas pressurized bearing water

~l accumulators (one each for the two circulators in .

l each primary . coolant loop) are provided. These l accumulators contain sufficient water to' permit

l. circulator coast-down~ without circulator damage. if-l both the normal and -the backup bearing water.

l supplies should fail.

-j During rise-to power ro peration to less :than l approximately .30% reactor , power',' the Emergency l Feedvater_ Header may not be..in service. :This.is tcc -

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l. - accommodate operational considerations. -The.heAderL l - must be able to! be made OPERABLE for driving 1thel

.l circulator water' turbines. ,

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2-2e l One circulator, operating with motive power from l either, l 1. Condensate or Boosted Firewater supplied via the l emergency condensate header, or l 2. Cendensate or ' Boosted Firewater supplied via the l emergency feedwater header, l provides sufficient primary coolant circulation to l assure SAFE SHUTDOWN COOLING. One circulator,

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l OPERATING _with motive power from feedwater, supplied ll via the emergency feedwater header, provides sufficient l - primary coolant : circulation - following a . postulated

~ depressurization accident. One circulator.in each loop l

l 1s specified to allow for a single failure in eithery

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~the. heat removal ' equipment or ' circulator . auxiliary

'l equipment which .provides -services'to'one loop. . SAFE

.l ' SHUTDOWN COOLING is' discussed Jin' the FSAR, Se.ction.

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Fort St. Vrain Technical Specifications Amendment No.

Page 4.2-2f l Specification LCO 4.2.1.2 - Number of OPERABLE l Circulators - LOW POWER, SHUTDOWN, and REFUELING l Limiting Conditions for Operation 1

l .There shall be at least one OPERABLE circulator.

l (SEE NOTE 1) l ,

APPLICABILITY: LOW POWER, SHUTDOWN and REFUELING.

l. ACTION: .

.l With 'all circulators inoperable l except as. ,

l- provided in NOTE 1, i l~ a). Insure that the . reactor is shutdown and l remains in that condition.

l. 'b) Immediately initiate action to. restore.at

.least one. circulator,to an OPERABLE status.

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Fort St. Vrain i Technical Spzcifications Amendment No.

Page 4.2-2g l NOTE: 1) All circulators may be made l inoperable provided  : 1) No l operations are undertaken which l will lead to a positive reactivity l insertion, and 2) The calculated l average core temperature does not l exceed 760 F.

l 2) A circulator shall be considered l OPERABLE in LOW POWER or SHUTDOWN l if the following conditions or l system requirements are met for-l .that circulator:

l .a) Emergency- Feedwater, or

~l Emergency Condensate, or-

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Boosted Firewater are available

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Fort St. Vrain Technical Spscifications Amendment No.

Page 4.2-2h I c) A source of makeup water to.the I bearing water surge tank i s I available.

l SURVEILLANCE REQUIREMENT (s): 5.2.7, 5.2.8, 5'2.9, .

-l 5.2.23.

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Technical Specifications 1

Amendment No.

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l Basis For Specification LCO 4.2.1.2 ,

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( l specified, provide assurance that the capability for i l continuous core cooling is maintained.

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l four~ circulators inoperable, the predetermined l period of time shall be limited such- that the

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average core temperature does not exceed 760'F. o l l-. This-' temperature .is the design steady state core l . inlet temperature.

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r- 1 Fort St. Vrain

. 7- Technical Sptcifications Amendment No.

Page 4.2-2k l Specification LCO 4.2.2 - OPERABLE Circulator l l Limiting Condition For Operation l Delete this specification in.its. entirety.

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Fort St. Vrain #1

- Technical Spscifications Amendment Page 4.2-3 l

l Seeeificatien LCO L.2.3 - Turbine Water Re= eval Pu=e. Limitina Conditions fer 0:eration There shall be one operable turbine water receval pump during i power operation.

Basis for Snecification LC0 h.2.3 1

One turbine water removal pump has sufficient capacity to remove

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! the water fran two circulator water turbines. This is adequate for

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a safe shutdown cooling.

i Soecification LCO k.2.k - Service Water Punes. Limitina Conditions l for Oneration At least two service water pumps and the associated pump pit l

shall be operable during power operation.

l Basis for Snecification LCO h.2.h The availability of the service water systaa ensures the capability 4 .

of supplying essential components with cooling water, as described in FSAR Sections 1.k 10 3, and ik.k.

Snecification LCO k.2.5 - Circulatina Water Makeun System. Limitinz Cen!Litions for Operaktion At least two circulating water makeup pumps -connectible to the t

i essential bus 'shall be operable during power operation. .

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-Basis for Snecification LCO k.2.5 l

Circulating water system makeup to the service water and fire protection system provides adequate makeup water to safely shut the reactor down from j

T i t ATTACHMENT 3 SIGNIFICANT HAZARDS ANALYSIS l ..

l

I Attachment 3

\t*t to P-85042 SIGNIFICANT HAZARDS ANALYSIS ANALYSIS The existing Specifications LCO 4.2.1 and LC0 4.2.2 have been deleted. These Specifications were combined to incorporate the definition of an operable circulator. This Specification has then been divided into two specifications, one for operation above 2%

power, and one for operation at or below 2% power.

The intent of the existing Specifications has been maintained and the new format.has been adopted. The requirement to maintain at least one operable circulator at all times has been incorporated into the proposed version of LC0 4.2.1.2.

CONCLUSION Based on-the above evaluation, it is concluded that operation of Fort St. Vrain in accordance with the proposed changes will -not' (1) involve a significant increase in the probability or consequences of an accident previously evaluated,-(2) create the possibility of a new or different kind of accident from any accident previously evaluated, or (3) involve a significant reduction in any margin of safety.

Therefore, these changes will not increase the risk .to the health and safety of the public nor do they- involve any significant- hazards.

considerations. ,

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