ML17249A309

Discusses NRC Review of LERs & Tech Spec Requirements Re Control RPI Sys at Westinghouse Pwrs.Requests Tech Specs Review to Ensure Requirement for Rod Maint to within +/- 12 Steps Indicated & RPI Sys Verified Accurate within 12 Steps

ML17249A309
Person / Time
Site:	Ginna
Issue date:	10/29/1979
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	White L ROCHESTER GAS & ELECTRIC CORP.
References
NUDOCS 7912050178
Download: ML17249A309 (10)

Text

C ttr. l.eon D. White, Jr.

2 w

"<<os 1NQ The present Westinghouse Standard Technical Specifications (W-STS) require all full length control rods to be positioned within + 12 steps Pndicated position) of their group step counter demand position.

Since numerous problems have developed in signal conditioning circuits for display indication of control rod position, the staff has determined that the "indicated position" requirement may be fulfilled by voltage measurements obtained from the position indication mechanism (and therefore no LER need be submitted) provided a sufficient data base has been established to ensure a correlation between voltage and position.

A copy of the current, applicable W-STS Specifications (3/4.1.3.1 and 3/4.1;3.2) are attached for your information and consideration.

It is requested that you review your present technical specifications to 'ensure that the control rods are required to be maintained within + 12 steps indicated, and that the rod position indication system is verified to Ee accurate to within 12 steps.

If your review indicates that this is not the case, you should so inform the Commission within 30 days of your receipt of this letter together with your plans to correct the deficiencies.

Any needed corrective actions may take several forms; such as (1) revising your technical specifications to limit control rod misalignment to no more than + 12 steps indicated position,

{2) seeking relief by performing analyses justifying (with 'penalties if needed) greater misalignments, or {3) proposing alternate or supplemental monitoring specifications to demonstrate compliance with the + 12 step indicated alignment requirement.

If you have any questions on this matter, please contact us.

Sincer'ely, O,ig.,e'.1.-.. 0abg g0RI [0 + j3C1110 Dennis L. Ziemann, Chief Operating 'Reactors Branch ¹2 Division of Operating Reactors

Enclosure:

W-STS Specifications 3/4.1.3.1 and 3/4.1.3.2 DO:

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Mr. Leon D. White, Jr. November 5, 1979 cc w/enclosure:

Lex K. Larson, Esquire

LeBoeuf, Lamb, Leiby 8 MacRae

. 1757 N Street, N.

W.

Washington, D. C.

20036 Mr. Michael Slade 12 Trailwood Circle

. Rochester, New York 14618 Rochester Committee for Scientific Information Robert E. Lee, Ph.D.

P. 0.

Box 5236 River Campus Station Rochester, New York 14627 J effrey Cohen New York State Energy Office Swan Street Building Core'1,, Second Floor

'Empire State Plaza

Albany, New York '2223 Director, Technical Development Programs State of New York Energy Office Agency Building 2 Empire State Plaza

Albany, New York 12223 Herbert Grossman, Esq.,

Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D.

C.

20555 Dr. Richard F. Cole Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D.

C.

20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission

',Washington, D.

C.

20555 Rochester Public Library 115 South Avenue Rochester, New York 14604

/

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REACTIVITY CONTROL SYSTEMS 3/4. 1.3

.MOVABLE CONTROL ASSEMBLIES

\\

GROUP HEIGHT LIMITING CONDITION FOR OPERATION 3.1.3.1 All full length (shutdown and control) rods, and all part length rods which are inserted in'he core, shall be OPERABLE and positioned within t 12 steps (indicated position) of.their group step counter demand position.

APPLICABILITY:

MODES 1" and 2"

'CTION:

a.

With one or. more full length rods inoperable due to being immovable as a result of excessive friction or mechanica'1 interference or known to be untrippable, determine that the SHJTDOWN MARGIN require-ment of Specification 3.1.1.1 is 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 HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

'b.

C.

With more than one full or part length rod ino"erable or misaligned from the group step counter demand position by more than

+ 12 steps (indicated position),

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

With one full or part length rod inoperable due to causes other than addressed by ACTION a,

above, or misaligned from its group step counter demand height by more than

+

12 steps (indicated position),

POWER OPERATION may continue provided that within one hour either:

1.

The rod is restored to OPERABLE status wi'hin the above alignment requirements, or 2.

The rod is declared ihoperable and the SHJTDOWN MARGIN requirement of Specification

3. l. 1.

1 is satisfied.

POWER OPERATION may then continue provided that:

a)

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 ope.a ion under these conditions.

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 />.

"See Special Tes: Exceptions

3. 10.2 and

3. 10.3.

W-STS 3/4 1-i4 0CT g

go;g

a-4 '

REACTIVITY CONTROL SYSTEMS LIMITING CONDITION FOR OPERATION (Continued) c)

A power distribution map is obtained from the movable incore detectors and F (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) fither the THERMAL POWER level is reduced to less than or equal to 75K 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 less than or equal to 85~ of RATED THERMAL POWER, or e)

The remainder of the rods in the'group with the inoperable rod are aligned to within +

12 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 Speci-fication (3. 1.3.6) during subsequent operation.

SURVEILLANCE RE UIREMENTS 4.1;3.1.1 The position of each full and part length rod shall be determined to be within the group demand limit by verifying the individual rod positions at leas 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 and each part length rod which is inserted in the core shall be determined to be OPERABLE by movement of at least 10 steps in any one direction at leas.

once per 31 days.

W-STS 3/4 1-15 lYigp g 5 @77

TABLE 3. 1-1 ACCIDENT ANALYSES RE.UIRING REEVALUATION IN THE EVENT OF AN INOPERABLE FULL OR PART LENGTH ROD Rdd Cluster Control Assembly Insertion Characteristics I

Rod Cluster Control Assembly Misalignment Loss Of Reactor Coolant From Smal'1 Ruptured Pipes Or From Cracks In Large Pipes Which Actuates The Emergency Core Cooling System Single Rod Cluster Control Assembly Withdrawal At Full Power Major Reactor Coolant'ystem Pipe Ruptures (Loss Of Coolant Accident)

Major Secondary System Pipe Rupture Rupture of a Con.rol Rod Drive Mechanism Housing (Rod Cluster Control Assemoly

="iec+ion)

W-STS 3/4 1-16 OCi 1

575

I

REACTIVITY CONTROL SYSTEMS'OSITION INDICATION SYSTEMS-OPERATING LIMITING CONDITION FOR OPERATION 3 ~ 1.3.2 The shutdown, control and part length control rod position indication system and the demand position indication system shall be OPERABLE and capable of determining the control rod positions within t 12 steps.

. APPLICABILITY:

MODES 1

and 2.

ACTION:

b.

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

l.

Determine the position of the non-indicating rod(s) indirectly by the movable incore detectors 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 immediately after any motion of the non-indicating rod which exceeds 24 steps in one direction since the last determination of the rod's position, or 2:

Reduce THERMAL POWER TO less than 50M 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 />.

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

I 1

~

Verify that all rod position indicators for the affected bank are OPERABLE and tha't the most withdrawn rod and the least withdrawn rod of the bank are within a maximum of 12 steps 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 THERMAL POWER to less than 50K 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 />.

SURVEILLANCE RE UIREMENTS

4. 1.3.2 Each rod position indicator shall be determined to be OPERABLE by verifying that the demand position indication system and the rod 'position indication system agree within 12 steps 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 compare the demand position indication system and the rod position indica-tion system at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

W"STS 3/4 1-17