ML19347D424

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Proposed Changes to Tech Specs 3.1.3 & 4.1.3 for Movable Control Assemblies
ML19347D424
Person / Time
Site: Beaver Valley
Issue date: 03/13/1981
From:
DUQUESNE LIGHT CO.
To:
Shared Package
ML19260G752 List:
References
NUDOCS 8103170582
Download: ML19347D424 (4)
v • d • e


Text

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l lEACTlVITY CONTROL SYSTEMS s

3/4.1.3 MOVABLE CONTROL ASSEMBLIES GROUP HEIGHT _

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 16 steps (deter:nined in accordance with Specification 3.1.3.2 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 imavable as a result of excessive friction or mechanical

~

interference or known to be untrippa61e, detemine that the SHUTDOWN MARGIN requirement of Specification 3.1.1.1 is e satisfied within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and be in H0T STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

b. With more than one full length rod 150PERABLE or indicated to be misaligned from any other rod in its group by more than

+ 16 steps (detemined in accordance with Specification 3.1.3.2),

IIe in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

c. With one full length rod inoperable or indicated to be misaligned from its group step counter demand height by more than i16 steps l (determined in ac'cordance with Specification 3.1.3.2), POWER .

OPERATION may continue provided 'that within one hour either:

1. The rod is restored to OPERABLE status within the above alignment requirements, or
2. The rod is declared inoperable and the SHUTDOWN MARGIN requirement of Specification 3.1.1.1 is satisfied.

POWER OPERATION may then continue provided that:

a) An analysis of the potential ejected red worth ,

is performed within 3 days and the rod worth is detemined to be < 0.95% Ak at zero power and

< 0.20% Ak at RATED THERMAL POWER for the Femainder of the fuel cycle, and b) The SHUTDOWN MARGIN requirement of Specification 3.1.1.1 is determined at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, and

  • See Special Test Exceptions 3.10.2 and 3.10.4 o , .

BEAVER VALLEY - UNIT 1 3/4 1-18 .

4' PROPOSED WORDING 8103170 5S k ,

REACTIVITY CONTROL SYSTEMS LIMITING CONDITION FOR OPERATION (Continued) c) The THERMAL POWER level is reduced to < 75% of RATED THERMAL POWER within one hour and within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> the high neutron flux trip setpoint is reduced to < 85% of RATED THERMAL POWER, or d) The remainder of the rods in the group with the inoperable rod are aligned to within + 16 steps of

' the inoperable rod within one 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 3.1.3.5 during subsequent operation.

SURVEILLANCE REQUIREMENTS 4.1.3.1.1 The position of each full length rod shall be determined to be within the group. demand lin,'.t by verifying the individual rod positi s at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> except during time intervals when the Rod Position Deviation Monitor is inoperable, then verify the group positions at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

4.1.3.1.2 Each full length rod not fully inserted shall be determined to be OPERABLE by movement of at least 10 steps in any one direction at least once per 31 days. ,

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BEAVER: VALLEY.- UNIT 1 3/4 1-19 PROPOSED WORDING

REACTIVITY CONTROL SYSTEMS POSITION INDICATOR CHANNELS LIMITING CONDITION FOR OPERATION I

3.1.3.2 For Cycle 2 operation, all shutdown and control rod position indicator channels and the demand position indication system shall be OPERABLE and capable of detemining the control rod positions within

+ 16 steps by direct analog indication or as a backup by measurement j of channel detector primary voltages. If a rod position indicator analog channel indicates 16 steps or more deviation from tne group demand l indicator, rod positions for the affected rods shall be detemined by measuring detector primary voltages, as follows:

a. f rimediately, if associated rods move greater than 8 steps (greater than 16 l b.

steps if all rods in the group have been detemined to be within 8 steps of the group demand indicator by primary voltage measure- I ments within the previous 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />),

c. at 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, intervals if the affected rod (s) .are not fully inserted

, or fully withdrawn,

d. at 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> intervals if the affected rod (s) are fully inserted or fully withdrawn.

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 withdrawn may be detemined by use of the detector primary voltage measurements.*

< APPLICABILITY: Modes 1 and 2*

ACTION:

a. If greater than 3 rod position indicators per bank, for banks not fully withdrawn or fully inserted, are INOPERABLE, then '

' declare the rod position indicator system to be INOPERABLE and be in HOT STANDSY within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after the allowed 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period and in COLD SHUTDOWN in the folicwing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Submit a Special Report to the NRC by telephone and in r

writing within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or by the close of the next business day, l whichever is later. Restore all affected Rod Position Indicators -

r to OPERABLE status prior to entry to Mode 2.

b. If the position of a maximum of one rod cannot be determined j by either the direct' reading of the rod position indicators or

' by reading primary detector voltage measurements, either:

1. Detemine the position of the non-indicating rod indir'ectly l

by the movable incore detectors immediately and at least c

' once per 8 . hours and ir. mediately after any motion of the non-indicating rod which exceeds 32 steps in one direction l since the last determination of the rod's position, or

2. Reduce THERMAL POWER TO < 50% cf RATED THERMAL POWER Ea within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

BEAVER VALLEY - UNIT 1 3/4 1-20 .

PROPOSED WORDING

REACTIVITY CONTROL SYSTEMS ACTION: (Continued)

c. With a maximum of one 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 16 steps of each other imediately after rod motion greater than 8 steps (greater than 16 steps if all rods in the group have been determined to be within 8 steps of the group demand indicator by voltage measurements within the previous 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />) and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, or 2.. Reduce THERMAL POWER TO < 50% of RATED THERMAL POWER within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
d. If the position of more than one rod cannot be detennined by either the direct reading of the rop position indicators or by reading primary detector voltage measurements, then Specification 3.0.3 is applicable.

SURVEILLANCE REQUIREMENTS 4.1. 3. 2 Each-rod position indicator channel shall be determined to be

. OPERABLE by verifying the demand position indication system and the rod position indicator channels agree within 16 steps at least once per 12 l hours (except during time intervals when the Rod Position Deviation Monitor is INCPERABLE or is in a continuous state of alarm), then compare the demand position indication system and the rod position indicator channels at approximately 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> intervals, as follows:

a. If an individual rod position indicator analog channel does not settle to within + 16 steps within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, then declare that l channel INOPERABLE. ,
b. For any INOPERABLE channel, no repairs or adjustments shall .

be permitted.without being followed immediately by a full range calibration.

l

  • For Core PHYSICS TESTING in Mode 2, primary detector voltage' measurements may be used to detennine the-position of rods in shutdown banks A and B and control banks A and B for the purpose of satisfying Specification 3.1.3.2. During Mode 2 operations, _ rod position indicators for shutdcwn banks A and B and control banks A and B may deviate from the group demand indicators by greater than + 16 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 banks A and B deviate by greater than + 16 steps from the group demand l P. ~

indicator, rod withdrawal or insertion may continue until the desired group height is achieved.

BEAVER VALLEY - UNIT 1 3/4 1-20A PROPOSED WORDING Lu g

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