ML20028G653

Proposed Tech Specs Re Rod Position Indication

ML20028G653
Person / Time
Site:	Beaver Valley
Issue date:	02/09/1983
From:	DUQUESNE LIGHT CO.
To:
Shared Package
ML20028G646	List: ML20028G645 ML20028G652 ML20028G653
References
NUDOCS 8302170196
Download: ML20028G653 (9)

Text

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LIMITING ODIDITION EOR CPERATION (Continued) b)

The SHUTDCEN MMGIN requirement of Specification 3.1.1.1 is detaminaa at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

c)

A power distribution map is obtained frcan the N

novable incore detectors and FQ(Z) and F H are verified to be within their limits within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

d)

A reevaluation of each accident analysis of Table 3.1-1 is performed within 5 days; this reevaluation shall confirm that the previously analyzed results of these accidents remain valid for the duration of operation under these conditions.

SURVEILIANCE REQUIREMENTS 4.1.3.1.1 Each shutdown and mntrol rod not fully inserted in the core shall be determined to be OPERABLE by movement of at least 10 stq:s in any one direction at least once per 31 days.

4.1.3.1.2 Each full length rod position shall be detaminad to be within 12 steps of the associated group demand counter by verifying the individual rod position 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 intervals when the Rod Position Deviation monitor is inoperable, then verify the group position at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

• See Special Test Exceptions 3.10.2 and 3.10.4 BEAVER VALLEY - UNIT 1 3/4 1-19 Proposed Wording P

REkCTIVITY CONTROL SYSTEMS

. POSITION INDICATION SYSTEMS-OPERATING LIMITING CONDITION FOR OPERATION 3.1.3.2 The shutdown and control rod position indication system shall be OPERALLE as follows:

Group Demand Counter (1) 1 per group Individual analog rod position instrument channel, 1 per rod + 12 steps (l) accuracy (3) l Automatic Rod Position Deviation Monitor (2), setpoints 3f12 steps, or, setpoint verification by recording analog / digital rod position at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

The provisions of Specification 3.0.4 are not applicable to this monitor (3),

(1)

During the first hour following rod motion, the group demand counter is the primary indicator of precise rod position infor-mation, with the analog channels displaying general rod movement information.

For power levels below 50%, a 1-hour thermal soak time is allowed before the analog channels are required to per-form within the specified accuracy.

(2)

For power levels below 50% a one hour thermal soak time is allowed.

Therefore, if a Rod Position Deviation Monitor alarm clears itself within this hour, the alarm is considered invalid.

(3)

The reporting requirements of Specification 6.9.1.9 are not applicable for the group demand counters, analog RPI or Rod Deviation Monitor providing that no actual rod misalignment existed due to the malfunction.

These malfunctions shall be reported in the monthly operating report.

BEAVER VALLEY - UNIT 1 3/4 1-20 Proposed Wording

LIMITING CONDITION EUR OPERATION (Continued)

APPLICABILITY:

MODES 1 and 2#

ACTION:

If the Rod Position Indicating System indicates (2) a potentially a.

misaligned rod (s), this indication shall be verified imediately (within 15 minutes) by measuring the analog rod position channel primary voltage. If this measurement confirms that a rod is misaligned, Specification 3.1.3.1.3.c is applicable.

i b.

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

i 1.

Verify that all rod position indicators for the affected i

bank are OPERABLE and that the most withdrawn rod and the least withdrawn rod of the bank are within a maximum of 12 steps (indicated position) of each other 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 THER%L POWER to less than 50% of RATED THER%L within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

I c.

With a maximam of one analog rod position indicator per bank ingerable,- (following a one-hour thenral soak at less than 50% of Rated Themal Power or at anytime when Rated Thermal Power is greater than or equal to 50%) either, 1.

Determine rod position for the affected rod (s) by measuring the detector prirrary voltage, as follows:

a.

Imediately b.

If the associated rod moved greater than 6 steps (greater than 12 steps if all the rcxis in the l

group have been determined to be within 6 steps l

of group derrand counter indicator by prirrary voltage treasurements 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 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 withdrawn, or EEAVER VALLEY - UNIT 1 3/4 1-20a Prcposed Wording

LIMITING CDNDITION FOR OPERATION (Continued) 4 If the position of a e ximum of one rod cannot be e.

determined by either the direct reading of the rod position indicators or by reading primary detector voltage measurements, 1.

De+amina the position of the non-indicating rod indir rtly by the mvable incore detectors innediately 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 /> and imediately after any mtion of the non-indicating rod which exceeds 24 steps in one direction since the last de amination of the r

rod's position.

f.

If the position of mre than one rod cannot be determined by either the direct reading of the rod position indicators or by reading primary detector voltage measurements, then Specification 3.0.3 is applicable.

2.

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

d.

. With the Automatic Rod Deviation Monitor inoperable, PWER OPERATION may continue provided that the deviation between the indicated positions is checked by the operator at least i

once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. 'Ihe provisions of Specification 3.0.4 are not applicable.(3) 4 1

SURVEILLANCE REQUIRDENTS 4.1.3.2.1 Each of the group demand counters shall be determined to I

be OPERABLE by:

a. Performing a CHANNEL CHECK by the group demand counters within a bank, and observing proper overlap

• of the in-l dicated positions, and

b. Performing a CHANNEL GECK by an interconparison between the control bank benchboard indicators and tie logic i

solid state indicators in the logic cabinet, and deter-mining their agreement within + 2 steps, at least once per 92 days.

During startup and shutdown, overlap mst be checked for all control banks at the respective bank overlap height transition points.

BEAVER VALLEY - UNIT 1 3/4 1-20b Proposed Wording

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SURVEILIAtEE FIGUIREMENTS (Continued) 4.1.3.2.2 Each of the analog red position indicators shall be de-termined to be OPERABLE by:

a. Performing a CHANNEL OlECK by intercomparison** between each analog rod position indicator and its corresponding group demand counter at least onm per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b. Performing a CHANNEL EUNCTIONAL TEST and CHANNEL CALIBRA-TION at least once per 18 nonths.

4.1.3.2.3 The Automatic Rod Deviation Monitor shall be determined to be CPERABLE by performing a functional test at least once per 7 days, and the deviation between the position indicated by the individual analog rod position instrument channel and the position indicated by the corresponding group demand counter shall be checked ** manually for each rod at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

GFor Core PHYSICS TESTING in Mode 2, primary detactor voltage measure-ments may be used to detamina the position of rods in shutdown banks A and B and control banks A and B for the purpose of satisfying Specifica-tien 3.1.3.2.

During Mode 2 operation, rod position indicators for shut-down banks A ard B and control banks A and B may deviate from the group demand indicators by greater than + 12 steps during reactor startup and shutdown cperations, 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 + 12 steps from the group demand indicator, rod withdrawal or insertion may continue until the desired group height is achieved. When the desired group height is achieved, a one hour soak time is allowed below 50% reactor power to permit stabilization of the rod position analog indicators. To attain thermal equilibrium during the one hour soak time, the absolute value of rod notion shall not exceed 6 steps.

• • For pavir levels below 50% one hour thermal " soak time" is permitted.

During this soak time, the absolute value of rod notion is limited to six steps.

BEAVER VALLEY - UNIT 1 3/4 1-20c l

Prcposed Wording I

REACTIVITY CENTROL SYSTES POSITION INDICATION SYST m-SHUIDOWN LIMITI!G CDIDITION EUR OPERATION 3.1.3.3 The group derrand position indicators shall be OPERABLE and capable of determining within + 2 steps the demand position for each shutdown or control rod not fully inserted.

APPLICABILITY:

lCDES 3*,

4*, and 5*

ACTION:

1ith less than the above required group demand position indicators OPERABLE, open the reactor trip system breakers.

SURVEILIANCE REQUIRDINTS 4.1.3.3 Each of the above required group demand position indicator (s) shhll be determined to be CPERABLE by novement of the associated co6 trol rod at least 10 steps in any one direction at least once per 31 days when the reactor coolant systen pressure is >400 psig.

• With the reactor trip system breakers in the closed position.

BEAVER VALLEY - UNIT 1 3/4 1-21 Proposed Wording

ATTACHMENT B S AFETY EVALUATION Proposed Change Request No. 66, Revision 6 amends the Beaver Valley Power Station, Unit No.1 Technical Specifications Appendix A, concerning Rod Position Indication.

4 The following Sections have been revised:

3.1.3.1, 3.1.3.2, and 3.1.3.3.

Section 3.1.3.1, Surveillance Requirement 4.1.3.1.2 has been added to conform to the Standard Technical Specification requirements.

The position of each full length rod shall be determined to be within

!12 steps of the associated group demand counter by verifying the indiv-idual rod position 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 four hours.

Section 3.1.3.2 has been revised to incorporate Note (3) applicable to the individual analog rod position instrument channel. Note (3) - The reporting requirements of specification 6.9.1.9 are not applicable for the group demand counters, analog rod position indicators or rod deviation monitor providing that no actual rod misalignment existed due to the mal-function. These types of malfunctions shall be reported in the monthly operating report.

Analog to digital setpoint verification has been added as an alternate method of determining that the Automatic Rod Position Deviation Monitor is operable.

This is done by recording the Analog / Digital rod position at least once per four hours.

The provisions of specification 3.0.4 are not applicable to this monitor because it is not necessary for the safe operation of the plant.

Note (3) is applicable to the Automatic Rod Deviation Monitor so that malfunctions will be reported in the monthly operating report.

Section 3.1.3.2(c) has been revised to permit a one hocr thermal soak period when the reactor is at less than 50% Rated Thermal Power before applying the Action statements.

Section 3.1.3.2(c)(1) has been amended to include items (e) and (f),

i j

which were in our specifications prior to amendment 51.

Item (e): If the position of a maximum of one rod cannot be determined by either the direct reading of the rod position indicators or by reading primary detector voltage measurements.

1.

Determine the position of the non-indicating rod indirectly by the movable incore detectors immediately and at lea st once per eight hours and immediately 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.

i

Sefsty Evaluation, (Continued)

Item (f): If the position of care than one rod cannot be determined by either the direct reading of the rod position indicators or by reading primary detector voltage measurements, then Specification 3.0.3 is applicable.

Section 3.1.3.2(d) has been revised to include Note (3).

A note has been added to Surveillance Requirement 4.1.3.2.1 to describe the requirement for observing proper overlap:

that during startup, overlap must be checked for all control banks at the respective bank overlap height transition points.

Section 3.1.3.3 has been revised so that the operability require-ment is applicable to the group demand position indicators.

The ACTION statement for this specification has been revised as follows: With less than the above required group demand position indicator (s) OPERABLE, open the reactor trip system breakers.

The Surveillance Requirement for this specification has been revised for applicability to the group demand position indicator (s):

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 when the reactor coolant system pressure is greater than 400 psig.

The requi.rement that the ECS pressure be > 400 psig ensures that the reactor vessel control rod drive mechanism housings are filled and vented thereby providing water for lubrication of the control rod drive mechanisms.

The operating practice at Beaver Valley Power Station is to maintain the shutdown banks fully withdrawn during plant heatup to permit rapid insertion of negative reactivity if required. This is the preferred mode whenever dilution capability exists while on RHR and at higher temperatures during heatup.

The following sections of the Updated Final Safety Analysis Report (UFSAR) were reviewed:

7.7.1.3.2 Rod Position Monitoring of Full Length Rods: 14.1.3 Rod Cluster Control Assembly Withdrawal at Full Power.

The revised specifications tend to reduce the potential for misleading information and spurious alarms that could generate ambiguity and lead to erroneous actions by the reactor operator.

Based on the UFSAR review, it has been determined that no change to the UFSAR is required as a result of this proposed change.

It is concluded that the revisions requested by this proposed Technical Spec-ification change will not increase the probability of occurrence or the consequence of an accident or malfunction of equipment important to safety previously evaluated in the UFSAR, nor will they create the pos-l sibility for an accident or malfunction of a different type not prev-iously evaluated...

,.-w

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.-e e-m----

se.fety Evaluation, (Continued)

The Technical Specification Bases, 3/4.1.3 Movable Control Assem-blies, were reviewed and there is nothing in the proposed changes which would decrease the margin of safety.

The OSC and ORC have reviewed this proposed change and based on the above safety evaluation, it is concluded there is reasonable assurance that the public health and safety will not be endangered by operation in the proposed manner.

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