Text

Proposed Tech Spec Changes Re Rod Position Indication
	ML20054E214
Person / Time
Site:	Beaver Valley
Issue date:	04/21/1982
From:	; DUQUESNE LIGHT CO.
To:	;
Shared Package
ML20054E211	List: ML20054E210; ML20054E214;
References
	NUDOCS 8204260263
	Download: ML20054E214 (12)
	v • d • e

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i REACTIVITY CONTROL SYSTEMS 3/4.1.3 MOVABLE CONTROL ASSEMBLIES GROUP HEIGHT LIMITING CONDITION FOR OPERATION 1

u 3.1.3.l All full length (shutdown and control) rods, and all part length rods which are inserted in the core, shall be OPERABLE and positioned within + 12 steps.(indicated position determined in accordance with Specification 3.1.3.2) of the REFERENCE POSITION corresponding to the group demand counter position within one hour af ter rod motion.

APPLICABILITY: MODES l* and 2*

ACTION:

a.

With one or more full length rods. inoperable due to being immovable as a result of excessive friction or mechanical interference or known to be untrippable, determine that the SHUTDOWN MARGIN i

requirement of Specification 3.1.1.1 is satisfied within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and be in HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

)

b.

With more than one' full or part length rod inoperable or misaligned from the REFERENCE POSITION by more than + 12 steps (indicated l

position), be in HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

4 c.

With one full or part length rod -inoperable-due;to causes other than r

addressed by ACTION a, above, or misaligned from its REFERENCE POSITION by more than 1.12_ steps (indicated position), POWER OPERATION may continue provided that within one hour either:

1.

The rod is restored-to QPERABLE status within the above; alignment requirements, or 2.

The remainder of the rods in the bank with the inoperable rod are aligned to within 112 steps of the inoperable rod while i-maintaining the rod sequence and insertion limits of Figures j

(3.1-1) and (3.1-2); the THERMAL POWEP level shall be restricted j

. pursuant to Specification (3.1.3.6) during subsequent operation, or i

3.

The rad is declared inoperable and the SHUTOOWN MARGIN f

lt requirement of Specification _3.1.1.1 is satisfied.

POWER OPERATION may then continue provided that:

Ij.

a)

A reevaluation of~ eacn accident analysis of Table 3.1-1 is l!

performed within 5 days; this reevaluation shall confirm 1-jj that the previously analyzed resul:s of these accidents

!l remain valid for the duration-of coeration under these i

conditions.

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SEAVER VALLEY - UNIT 1 3/4 1-13 8204260#O

REACTIVITY CONTROL SYSTEMS LIMITING CONDITION FOR OPERATION (Continued) f b)

The SHUTC0WN MARGIN requirement of Specification 3.1.1.1 is determined at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

c)

A power distribution map is obta,ined from the movable incore detectors and Fg(Z) and FNH are verified to be within their limits within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

d)

The THERMAL POWER level is reduced to less than or equal to 75% of RATED THERMAL POWER within one hour and within l

the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months the high neutron flux trip setpoint is i

reduced to less than or equal to 85% of RATED THERMAL POWER. THERMAL POWER shall be maintained less than or jl equal to 75% of RATED THERMAL POWER until compliance with l

ACTIONS 3.1.3.1.c.3.a and 3.1.3.1.c.3.c above are ll demonstrated.

llSURVEILLANCEREQUIREMENTS I !4.1. 3.1.1 The position of each full and part length rod shall be determined to l

!!be within + 12 steps (indicated position) of the REFERENCE POSITION corresponding

!ito the group demand position at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months (allowing for one hour ll thermal soak af ter rod motion) except during time intervals when the Rod Position l

liDeviation Monitor is inoperable, then verify the group positions at least once per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

'4.1. 3.1. 2 Each full length rod not fully inserted in the.. core shall be determined to be OPERABLt by movement of at least 10 steps in any one direction at least once per 31 days.

See Special Test Exceptions 3/4 10.2 and 3/4 10.4 t1 I

'EEA'!ER 74L_EY

.'.C 1

3/4 1-19

4 TABLE 3.1-1 ACCIDENT ANALYSES REQUIRING REEVALUATION IN THE EVENT OF AN INOPERABLE FULL OR PART LENGTH ROD Rod Cluster Control Assembly Insertion Characteristics Rod Cluster Control Assembly Misalignment Loss Of Reactor Coolant From Small Ruptured Pipes Or From Cracked Large Pipes Which Actuates The Emergency Core Cooling System Single Rod Cluster Control Assembly Withdrawal At Full Power Major Reactor Coolant System Pipe Ruptures (Loss Of Coolant Accident)

Major Secondary System Pipe Rupture Rupture of a Control Rod Drive Mechanism Housing (Rod Cluster Control Assembly Ejection) i i

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,1 EEAVER VALLEY - UNIT i 3/4 i-19a

REACTIVITY C0f4 TROL SYSTEMS POSITI0ft INDICATI0ft SYSTEMS-0PERATIf1G LIMITIf4G C0f1DITI0ft FOR OPERATI0fl 3.1.3.2 The shutdown and control individual rod position indication system and the demand position indication system shall be OPERABLE cnd capable of determining the actual and demanded control *od positions, respectively, as follows:

Analog rod position, within one hour af ter rod motion (allowance for thermal soak)

All shutdown banks -

116 steps of the group demand counters for withdrawal range of 0-30 steps 112 steps of the group demand counters for withdrawal range of 200-228 steps Control Banks A and B -

116 steps of the group demand counters for withdrawal range of 0-30 steps i 12 steps of the group demand counters for withdrawal range of 200-228 steps Control Banks C and D -

116 steps of the group demand counters for withdrawal range of 0-30 steps 112 steps of the group demand counters for withdrawal range of 150-228 steps Group Demand Counters; 12 steps The actual analog rod position shall be determined by direct analog indication or, as a backup, by measurement of channel detector primary voltages.

If a rod position indicator exceeds the allowed deviation specified above, rod positions for the affected rods shall be determined by measuring detector primary voltages, as follows:

l a.

Immediately-l l,

b.

If associated rods move greater tnan 6 steps (greater than 12 steps if ll all rods in the group have been determined to be within 6 steps of the group demand indicator by primary voltage measurements within the previous a hours) f' c.

At 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months intervals if the affected rod (s) are not fully inserted or wi tndrawn

!i

[

d.

At 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months intervals if the affected rod (s) are fully inserted or witndrawn.

3EAVER VALLE'i - J.'iII I 3/d I-20

REACTIVITY CONTROL SYSTEMS LIMITIflG C0tlDITION FOR CPERATI0ft (continued) l When the rod position indicator channel is INOPERABLE, the position of not

. ;more than three control rods per bank which are not fully inserted or fully I withdrawn may be determined by use of the detector primary voltage measurements.*

APPLICABILITY: MODES 1 and 2*

ACTION:

4 ll a.

With a maximum of three analog rod position indicators per bank IN0PERABLE, i:

either:

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1.

Determine the position of the non-indicating rod (s) indirectly j.

by the movable incore detectors at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and within one hour af ter any motion of the non-indicating rod which exceeds 24 steps in one direction since the last determination of the rod's position, or i.

2.

Reduce THERMAL POWER to less than 50". of RATED THERMAL POWER within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

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b.

With a maximum of one group demand position indicator per bank INOPERABLE, either:

1.

Verify that all rod position indicators for the affected bank are OPERABLE and that the most withdrawn rod and the least withdrawn rod of the bank are within a maximum of 12 steps (corrected indicated position) of each other at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , or 2.

Reduce THERMAL POWER to less than 50% of RATED THERftAL POWER within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

SURVEILLANCE REQUIREMENTS 4.1.3.2.1 Each analog rod position indicator shall be determined to be OPERABLE by l verifying that the demand position indication system and the rod position

! indication system (by use of the REFERENCE POSITION) agree within 12 steps j {(allowing for one hour thermal soak af ter rod motion) at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months i;except during time intervals when the Rod Position Deviation Monitor is inoperable,

!!thencenpara the demand position indication system and the rod position indication

,; system (by use of the REFERENCE POSITION) at least once per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

For any

TIN 0PERABLE cnannel, no repairs or adjustments shall be permitted without being

followed immediately by a full range calibration.

EEn ER VALLEY..N:

1 3/4 1-20a

REACTIVITY CONTROL SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) ll 1

!!4.1.3.2.2 Each of the above required rod position indicator (s) shall be l determined to be OPERABLE by performance of a CHANNEL FUNCTIONAL TEST at least ljlonceper18 months.

Ill'

!l::

For Core PHYSICS TESTING in Mode 2, primary detector voltage measurements may be used to determine the position of rods in shutdown banks A and B

'i and control banks A and B for the purpose of satisfying Specification j

3.1. 3. 2.

During Mode 2 operations, rod position indicators for shutdown I

banks A and B and control banks A and 8 may deviate from the group demand indicators by greater than + 16I steps during reactor startup l

and shutdown operations, while rods are being withdrawn or inserted.

If the rod position indicators for shutdown banks A and B and control I

banks A and 8 deviate by greater than + 16l steps from the group demand ir.dicator, rod withdrawal or insertion may continue until the desired l!

group height is achieved.

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3E.L.ER !?iLEY - UII i 3/

l'2CD

REACTIVITY CONTROL SYSTEMS POSITION INDICATION SYSTEM-SHUTDOWN LIMITING CONDITION FOR OPERATION 3.1.3.3 The group demand position indicator shall be OPERABLE and capable of determining within + 2 steps the demand position for each shutdown, control or part length rod not fully inserted.

APPLICABILITY: MODE 3*#

ACTION:

With less than the above required group demand position indicator (s) OPERABLE, immediately open the reactor trip system breakers.

SURVEILLANCE REQUIREMENT (

4.1.3.3 Each of the above required group demand position indicator (s) shall be determined to be OPERABLE by movement of the associated control rod at least 10 steps in any one direction at least once per 31 days.

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lI ll EEAVER VALLEY - UN:7 1 3/4 i-21

REACTIVITY CONTROL SYSTEMS SHUTDOWN ROD INSERTION LIMIT LIMITING CONDITION FOR OPERATION 3.1.3.4 All shutdown rods shall be fully withdrawn.

APPLICABILITY:

MODES 1* and 2*#

ACTION:

With a maximum of one shutdown rod not fully withdrawn, except for surveillance testing pursuant to Specification (4.1.3.1.2), within one hour either:

a.

Fully withdraw the rod, or b.

Declare the rod to be inoperable and apply Specification (3.1.3.1).

SURVEILLANCE REQUIREMENTS 4.1.3.4 Each shutdown rod shall be determined to be fully withdrawn by use of the group demand counters, and verified by the analog rod position indicators within one hour af ter rod motion, a.

Within 15 minutes prior to withdrawal of any rods in control banks A, B, C or D during an approach to reactor criticality, and b.

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter.

See special test exceptions 3/4 10.2 and 3/4 10.3 leldWithKoff>1.0 i

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SEA'.'ER VALLEY - JNIT 1 3'l 1-22 f

e REACTIVITY CONTROL SYSTEMS CONTROL R0D INSERTION LIMITS LIMITING CONDITION FOR OPERATION 3.1.3.5 The control banks shall be limited in physical insertion as shown in Figures (5.1-1) and (3.1-2).

APPLICABILITY:

MODES l* and 2*#.

ACTION:

With the control banks inserted beyond the above insertion limits, except for surveillance testing pursuant to Specification (4.1.3.1.2), either:

a.

Restore the control banks to within the limits within two hours, or b

Reduce THERMAL POWER within two hours to less than or equal to that fraction of RATED THERMAL POWER wnich is allowed by the group position using the above figures, or c.

Be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.1.3.5 The position of each control bank shall be determined to be within the insertion limits at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , by use of the group demand counters and verified by the analog rod position indicators, except during time intervals when the Rod Insertion Limit Monitor is inoperable, then verify the individual rod positions at least once per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

I

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[I*SeeSpecialTestExceptions3.10.2and3.10.4

= Wito f,eff > 1.0 i

l i, SEAVER VALLEY - GN:T 1 3/" l-23

REACTIVITY CONTROL SYSTEMS BASES 3/4.1.3 MOVABLE CONTROL ASSEMBLIES l

lThe specifications of this section ensure that (1) acceptable power distribution limits are maintained, (2) the minimum SHUTOOWN MARGIN is maintained, and (3) l OPERABILITY of the control rod position indicators is required to determine limit the potential effects of rod misalignment on associated accident analyses.

control rod positions and thereby ensure compliance with the control rod alignment and insertion limits. OPERABLE condition for the analog rod position indicators t,is defined as being capable of indicating rod position to within 112 steps of

!!the reference position except for the range of 0 to 30 steps at the bottom of the l core where a deviation of 116 steps is permitted.

For the Shutdown Banks, I jControl Banks A and B, the REFERENCE POSITION is defined as the group demand 1 jcounter indicated position between 0 and 30 steps withdrawn inclusive, and between 200 and 228 steps withdrawn inclusive.

This permits the operator to verify that l the control rods in these banks are either fully withdrawn or fully inserted, the

! normal operating modes for these banks.

Knowledge of these bank positions in these ltwo areas satisfies all accident analysis assumptions concerning their position.

,lFor Control Banks C and D, the REFERENCE POSITION is defined as the group demand

counter indicated position between 0 and 30 steps withdrawn inclusive, and between 150 and 228 steps withdrawn inclusive.

For the withdrawal range of 31 to 149 steps inclusive, the REFERENCE POSITION is defined as the individual "d calibration curve noting indicated analog rod position vs indicated group o nd counter position (Figure B 3/4.1-1). Comparison of the indicatqd analog rod position to the calibration curve is sufficient to allow determination that a control rod is indeed misaligned from its bank.

Comparison of the group demand counters to the bank insertion limits with verification of rod position with the analog rod

, position indicators (af ter thermal soak after rod motion) is sufficient verification that the control rods are above the insertion limits.

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ll it 3EW/ER 'iK.EY - TiG '

3 3/4 l-d

REACTIVITY CONTROL SYSTEMS BASES The ACTION statements which permit limited variations from the basic requirements are accompanied by additional restrictions which ensure that the

, original design criteria are met. Misalignment of a rod requires measurerc.ent

. jof peaking factors and a restriction in THERMAL POWER. These restrictions

provide assurance of fuel rod integrity during continued operation.

In addition,

~

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

Control rod positions and OPERABILITY of the rod position indicators are

. required to be verified on a nominal basis of once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months with more

! frequent verifications required if an automatic monitoring channel is inoperable.

'These verification frequencies are adequate for assuring that the applicable LCOs are satisfied.

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,EEAVE3 VAL >_EV -.N:T I 3 3/2 1-5

ML20054E214

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