ML20113D507

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Proposed Tech Spec 3/4.1.3, Moveable Control Assemblies, Revising Time to Determine Source of Control Rod Inoperability
ML20113D507
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 04/09/1985
From:
SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20113D497 List:
References
NUDOCS 8504150329
Download: ML20113D507 (9)
v • d • e


Text

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REACTIVITY CONTROL SYSTEMS .

3/4.1.3 MOVABLE CONTROL ASSEMBLIES GROUP HEIGHT-O LIMITING CONDITION FOR OPERATION 3.1.3.1 All full length (shutdown and control.) rods which are inserted in the core shall be OPERABLE and positioned within i 12 steps (indicated position)

. of their group step counter demand position.

APPLICABILITY: MODES 1* and 2*

ACTION:

. a. With one or more full length rods inoperable due to being immovable l' as a result of excessive friction or mechanical interference or known to be untrippable, determine th'at the SHUTDOWN MARGIN require-ment of Specification 3.1.1.1 is satisfied within l' hour.and be in HOT . STANDBY 91 thin 6 hcurs.

b. With more .than orie fi u11 length rod misa11gned from the group step

~

l l . counter ' demand' position by more than ~

+ 12 steps (indicated position),

. be in~ HOT STARDBY within~6 hours.

i

c. With more than one full length rod inoperable due to a rod control

~

urgent failure alarm or obvious electrical problem in the rod control system for greater than'72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, be in HOT STANDBY 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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d. -With one full length rod ' inoperable due to causes other than addressed by ACTION a, above, or misaligned from its gmup step i! -

counter. demand height by more than + 12 steps (indicated position), .

p .

POWER OPERATION may continufprovideTthat'within one hour either:

- 1. . The rod is restored to OPERABLE istatus'within the above~ aliganent

~

? ' requirements, or

l. 2. 'The remainder'of the rods in the group with the inoperable rod l are aligned to within + 12 steps .of the inoperable rod within one l

hour while maintaining the rod sequence and insertion limits of Figures 3.1-1 and 3.1-2; the THERMAL POWER level shall be

' restricted pursuant to Specification 3.1.3.6 during subsequent i.. . operation, or i

=,

3. The rod is declared inoperable and the.SHUTDDWN MARGIN ^
requirement of Specification 3.1.1.1 is satisfied. POWER

.' DPERATION may then continue'provided that:

}

i, '

  • 5ee SpecfiTTest Exceptions 3.10.2 and 3.10.3. .
SUMMER - UNIT 1 3/4 1-14 l

8504150329 850409 PDR ADOCK 05000395

! P PDR

\ -

r REACTIVITY CONTROL SYSTEMS BASES MOVABLE CONTROL ASSEMBLIES (Continued) .

For purposes of determining compliance with Technical Specification 3.1.3.1, any inoperability of full length control rod (s), due to being imovable, invokes ACTION statement "a .

The intent of Technical Specification 3.1.3.1 ACTION statement "a" is to ensure that before leaving ACTION statement "a" and utilizing ACTION statement "c" that the rod urgent failure alam is illuminated or that an obvious electrical problem is detected in the rod control system by minimal electrical troubleshooting techniques. Expeditious action will be taken to determine if rod imovaM13 ty is due to an electrical problem in the rod control system.

7e ACTION statements which permit limited variations from the basic r: wirements are accompanied by additional restrictions which ensure that the riginal design criteria are met. . Misalignment of.a rod requires measurement of peaking factors or a restriction in. THERMAL POWER; either of these restric-tions provide assurance 'of fuel. rod integrity during continued operation. In -

addition, those safety analyses affected by a misaligned rod are reevaluated to confirm that the results remain valid during future operation.

The maximum rod drop time restriction is consistent with the assumed rod drop time used in the safety analyses. Measurement with T ,yg greater than or equal to 551'F and with all reactor coo.lant pumps. operating ensures that the measured drop times will be representative of. insertion times experienced during a reactor trip at operating c,onditions.

l. Control rod positions and .0PERABILITY of the rod position indicators are

' required to be verified on a nominal basis of once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> with more l :" frequent verifications required if an automatic monitoring channel is inoperable.

These verification frequencies are adequate for assuring that the applicable 7, LCO's are satisfied.

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9 l SUMMER - UNIT 1 B 3/41-4 j .

o.

SHUTDOWN GROUP 1 - 4 BANK A

- GROUP 2- 4 SHUTDOWN GROUP 1 - 4 BANK B

- GROUP 2- 4 MECHANISM ARR NGEMENTS ,

CONTROL - GROUP 1- 4 BANK A

- GROUP 2- 4 CONTROL - GROUP 1 4 BM B

- GROUP 2- 4 CONTROL - GROUP 1- 4 0

- GROUP 2- 4 CONTROL GROUP 1- 4

- BANK D

- GROUP 2- 4 i

, 48 i

4 Arrangements of Mechanism Banks and Groups Figure 1.

l

- - - - - .- ,,y

MAIN CONTROL ROOM CONTROLS o IN-HOLD-0UT LEVEL o BANK SELECTOR SWITCH

- MANUAL

- AUTO

.- SHUTDOWN BANK A, B

- CONTROL BANK A, B, C, D

, o STEP COUNTERS SHOW DEMANDED POSITION o IN-0UT LIGHTS o STARTU? PUSHSUTTON I

l o ALARM RESET PUSHBUTTON

{

o LIFT COIL DISCONNECT SWITCHES o ANNUNCIATORS

- ROD CONTROL ORGENT ALARM

- ROD CONTROL NON-URGENT ALARM FIGURE 2

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URGENT ALARM - POWER CABINET o REGULATION FAILURE o PHASE FAILURE o LOGIC ERROR o MULTIPLEXING ERROR o CARD MISSING URGENT ALARM - LOGIC CABINET o SLAVE CYCLER RECEIVES A GO PULSE DURING A STEP o OSCILLATOR FAILURE -

o CARD MISSING URGENT ALARii EFFECT ON SYSTEM o AUTOMATIC R0D MOVEMENT IS STOPPED o MANUAL MOVEMENT OF SELECTED BANK IS PERMITTED IF LOGIC CABINET AND POWER CABINET ARE NOT IN URGENT j ALARM i

j NON-URGENT ALARM - LOGIC OR POWER CABINET i o REDUNDANT POWER SUPPLY FAILURE l

FIGURE 6 1

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t HO'r: TO DISTINGUISH BETWEEN CONTROL SYSTEM AND MECHANISM PROBLEMS

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/' o URGENT ALARM - MUST BE' CONTROL SYSTEM FAILURE o NO URGENT ALARM, ON$ OR MORE RODS WON'T MOVE

- MONITOR COIL CURRENTS

- CONTROL SYSTEM WON'T VARY CURRENTS.-

PROBLEM M.UST BE IN CONTROL SYSTEM e

- CONTROL SYSTEM VARIES CURRENT TO COILS NORMALLY - SUSPECT MECHANISM

- CURRENTS ABNORMAL

- GROSSLY ABNORMAL - SUSPECT CONTROL SYSTEM

- MILDLY ABNORMAL - SUSPECT

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MECHANISM R

FIGURE 7 r-- , - - . . , _

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