ML20095G479

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Proposed Tech Specs 3.4.2, Flow Control Valves Re Proposed Deletion of Average Rate of Movement Verification Requirement
ML20095G479
Person / Time
Site: Clinton Constellation icon.png
Issue date: 12/14/1995
From:
ILLINOIS POWER CO.
To:
Shared Package
ML20095G464 List:
References
NUDOCS 9512210055
Download: ML20095G479 (8)
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Text

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Attachment 3  ;

to U-602499-LS-95-013 Page1of3 Attached Marked-Up Pages of the Technical Specifications ,

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^ 9512210055 951214 PDR ADOCK 05000461 P PDR

Attachment 3 to U-602499 l

- LS-95-013 Page 2 of 7

- FCVs 3.4.2 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.2 Flow Control Valves (FCVs)

LC0 3.4.2 A recirculation loop FCV shall be OPERABLE in each operating recirculation loop.

1 APPLICABILITY: MODES 1 and 2. I ACTIONS

NOTE-------------------------------------

Separate Condition entry is allowed for each FCV.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or two required A.1 Lock up the FCV. 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> FCVs inoperable.

B. Required Action and 8.1 Be in MODE 3. 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.4.2.1 Verify each FCV fails "as is" on loss of 18 months hydraulic pressure at the hydraulic unit.

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-(continued)*~

s CLINTON 3.4-6 Araendment No. J' '

Attachment 3 to U-602499 LS-93-013 Page 3 of 3 3.4 2 i

SURVEILLAdREQUIREMENTS continued) [ [ /

[ SURVEILLANCE [ FREQ NCY 3.4.2.2 rify average ra of each FCV mov ent 18 onths is:

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a. s 11% o stroke per secon for openi  ; and
b. s 1% of stroke per econd for osing.

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CLINTON 3.4-7 AmendmentNo.JHI

Attachment 4 to U-602499

. LS-95-013 Page1of5 Technical Specification Bases Changes i

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Attachment 4 to U-602499 l

- LS-95-013 Page 2 of 5 FCVs B 3.4.2 9

I B 3.4 REACTOR COOLANT SYSTEM (RCS)

B 3.4.2 Flow Control Valves (FCVs)

BASES l BACKGROUND The Reactor Coolant Recirculation System is described in the Background section of the Bases for LCO 3.4.1,

" Recirculation Loops Operating," which discusses the operating characteristics of the system and how this affects -

the design basis transient and accident analyses. The jet pumps and the FCVs are part of the Reactor Coolant Recirculation' System. The jet pumps are described in the Bases for LCO 3.4.3, " Jet Pumps."

The Recirculation Flow Control System consists of the electronic and hydraulic components necessary for the positioning of the two hydraulically actuated FCVs. The .

recirculation loop flow rate can be rapidly changed within lI the expected flow range, in response to rapid changes in system demand. Limits on the system response are required to minimize the impact on core flow response during certain ,

accidents and transients. Solid state control logic will l generate an FCV " motion inhibit" signal in response to any

one of several hydraulic power unit or analog control circuit failure signals. The " motion inhibit" signal causes hydraulic power unit shutdown and hydraulic isolation such that the FCVs fail "as is."

APPLICABL he FCV stroke Ys a d er second in SAFETY ANALYSES the openinglandpciosing directi a con i failure aximum demand. roke ra e54s-an q<e.

gg, o control 5** g h' e

- assumpti the analysis of the recircula failures decreasing an i sing flow (Refs. I and 2).

> W ese Flow control valves satisfy erion 2 of the NRC Policy Statement.

LC0 An FCV in each operating recirculation loop must be OPERABLE to ensure that the assumptions of the design basis transient and accident analyses are satisfied.

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Tn oMlWon) WE LOC A candqs.'S cf ReQuence '

ge, ht %e inh \ coYe f-tow (espor4e M gwcen i n %e. Onbrob lcoP. Imp \!c.!F in%is Porr9 Coa 6hicun assornp+ ton K %:r he FCN posWors cEce6 not Chqe. i0 .e . ,

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CLINTON B 3.4-9 RevisionNo.g

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Attachmeiit T to U-@@26@ F - ~~~~~

LS-95-013 i Page 3 of 5  !

FCVS B 3.4.2 )

BASES (continued)  !

APPLICABILITY In MODES 1 and 2, the FCVs are required to be OPERABLE, since during these conditions there is considerable energy in the reactor core, and the limiting design basis l transients and accidents are assumed to occur. In MODES 3,  !

4, and 5, the consequences of a transient or accident are j reduced and OPERABILITY of the flow control valves is not  :

important. l ACTIONS A Note has been provided to modify the ACTIONS related to FCVs. Section 1.3, Completion Times, specifies once a Condition has been entered, subsequent divisions, subsystems, components or variables expressed in the l' Condition, discovered to be inoperable or not within limits, will not result in separate entry into the Condition.

Section 1.3 also specifies Required Actions of the Condition continue to apply for each additional failure, with Completion Times based on initial entry into the Condition.

However, the Required Actions for inoperable FCVs provide appropriate compensatory measures for separate inoperable FCVs. As such, a Note has been provided that allows separate Condition entry for each inoperable FCV.

A.1 With one or two required FCVs inoperable, the assumptions of the desi asis transient and accident analyses may not be

""b met and inoperable FCV must be returned to OPERABLE  ;

status o ydraulically locked within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. t

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^p;;ing : FCY f::ter th:: th: !!:it :: ld re:elt in : : Ore- l

vere f1= rencut tr:::t::t, re:elting in viel: tic Of th:  ;

S:f:ty Li=it "CPR. Closing an FCV f::t:r th: the limit d@ D6 *  :::r :c " in: LOCA :::ly:i: TOUTriTreYtfie7ecirculation dehfrs W.S ow s og, suttimfWhighe  :,, _. p::ures.

ad tem f Ih an FCV is inoperab: de: t: ,,

g7%e, y -f::ter ..2 wi

_. _15t_ts.)eactiva3mfth1hraTVe T essentially lock the valve in position, which p en l wn],pr.oltibit the FCV from adversely affecting the DB end-tr:::i: ' Tnalyses. Continued operation is allowed in s l n on. 1 The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time is a reasonable time period to complete the Required Action, while limiting the time of operation with an inoperable FCV.

(continued 1 CLINTON B 3.4-10 RevisionNo.)/

'. LS-954013 Page 4 of 5 FCVs

  • B 3.4.2 l

BASES ACTIONS B.1 (continued) If the FCVs are not deactivated, (locked up) and cannot be restored to OPERABLE status within the associated Completion Time, the unit must be brought to a MODE in which the LC0

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does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This brings the unit to a condition where the flow coastdown characteristics of the recirculation loop are not important. The allowed Completion Time of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit l systems.

1 SURVEILLANCE SR 3.4.2.1 ,

REQUIREMENTS Hydraulic power unit pilot operated isolation valves located between the servo valves and the common "open" and "close" lines are required to close in the event of a loss of hydraulic pressure. When closed, these valves inhibit FCV motion by blocking hydraulic pressure from the servo valve

- to the common open and close lines as well as to the alternate subloop. This Sur illycaMf asJ%on ressur gas amorneOn we. deqn 7 Te mo ency is based on the need to perform this Surveillance under the conditions that apply during a plant outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power.

Operating experience has shown these components usually pass the SR when performed at the 18 month Frequency. Therefore, the Frequency was concluded to be acceptable from a reliability standpoint.

(SR 3'4.2.2 T s SR ens res the erall av rage rate f FCV m ement is intaine within t e analyze limits. ince th rate of CV move nt is li ited elec ronically testing ver a portion f the F travel i represe ative of all FCV positi s. Ther fore, th overall erage ra e of FCV move nt can b determin by timi the FCV movement o er ay por on of th FCV trav .g (continued)

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CLINTON B 3.4-11 Revision No. M

'. LS-95-013 Page 5 of 5

  • FCVs B 3.4.2 BASES {coM!M  ;

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SURVEILLA E SR 3.4.2.7 (continued) -

REQUIREM TS The 18 onth Frequency is b ed on the need to perfo this Sury llance under the co itions that apply durin a plant i out ge and the potentia for an unplanned transi t if the i S veillance were per rmed with the reactor a power.

perating experienc as shown these compone s usually pass the SR when perfo d at the 18 month Freq ncy. Therefore,

/ the Frequency was concluded to be accepta e from a reliability stan point.

REFERENCES 1. USAR, Section 15.3.2. l

2. USAR, Section 15.4.5.
3. USAR, Section 6.3.3. l l
4. USAR, Section 5.4.1.

l CLINTON B 3.4-12 Revision No. 1d*

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