ML060610711

Technical Specifications, OPRM Instrumentation, Addition of Oscillation Power Range Monitor

ML060610711
Person / Time
Site:	Clinton
Issue date:	02/15/2006
From:	Plant Licensing Branch III-2
To:
References
TAC MC6551
Download: ML060610711 (5)

Text

applicable, but should include an uncertainty treatment that accounts for the number of failed sensors permitted by the TSs of the plant's applicant.

The licensee stated that the methodology as described in NEDO-324165-A was followed for the PBDA including the analysis of sensor failure in the CPRM system, the cycle-specific analysis for the applicability of the scram setpoints, and the OPRM system operability. This is acceptable because the procedures specified in the approved methodology are used.

(c) Implementation of Option IlIl will require that the selected bypass region outside of which the detect and suppress action is deactivated be defined in the TSs.

The licensee confirmed that this region is included in surveillance requirement (SR) 3.3.1.3.5. The exclusion region methodology (safety analyses contained in NEDO-31960) would define a curved region on the power to flow operating map cutting across the corner of the map near the intersection of the natural circulation line and the highest flow control line. The staff finds this acceptable because the proposed exclusion region in conjunction with SR 3.3.1.'3.5 is consistent with the boundaries discussed in NEDO-32465-A, Section 2.2.

(d) If the algorithms detect oscillations, an automatic protective action should be initiated. This action may be a full scram or a selected rod insert (SRI).

The licensee confirmed that the automatic protective action of the OPRRMs at CPS will be a full reactor scramri, rather than an SRI. The staff finds this acceptable because the action is in compliance with GDCs 10 and 12.

(e) The LPRM groupings defined in NEDO-31960-A to provide input to Option IlIl algorithms are acceptable for the intended oscillation detection function. These LPRM groupings are the oscillation power range monitor for Option III.

The licensee stated that the LPRM assignments in Appendix D of NEDO-32465-A are identified as examples of the expected LPRM assignments that a licensee may choose without identifying the configuration which is used at CPS. The staff has reviewed the licensee's description and finds it acceptable because the configuration chosen is provided as one of the examples in NEDO-32465-A and NEDO-31960-A. However, the final configuration should be documented.

The staff finds that the licensee has adequately demonstrated the applicability of the topical reports by addressing the actions identified in the staff's SERs approving the topical reports.

3. Provide a plant-specific TS for the OPRM functions consistent with CENPD-400-P, Appendix A.

In its submittal, the licensee stated that the proposed TS is consistent with CENPD-400-P, Appendix A, except for the following deviations:

(a) A new TS for the OPRM instrumentation, which includes the limiting condition for operation (LCO), Applicability, Actions and SRs necessary to define the operability of the OPRM channels, and the actions that must be taken by the plant operators when the instruments become inoperable. TS Sectibn 3.3.1.3 requires four channels of the OPRM instrumentation to be operable when reactor power is 21.6 percent RTP. In addition, a note was added in the ACTIONS section which states that "Separate Condition entry is allowed for each channel."

(b) LCOs A, B and C have been added which are consistent with the referenced topical reports.

(c) SRs 3.3.1.3.1 through 3.3.1.3.6 have been added. There are some deviations from the referenced topical reports which are addressed in Section 3.2 of this safety evaluation. A note is added which states that "When a channel is placed in an inoperable status solely for performance of required Surveillance, entry into associated Conditions and Required Actions may be delayed for up to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> provided the OPRM maintains trip capability." Also, a statement is added to SR 3.3.1.3.3 to state that the setpoints for the trip function are specified in the COLR.

(d) Pages B 3.3-39a through B 3.3-39k have been added to provide the Bases for TS Section 3.3.1.3.

(2) Revise TS Section 3.4.1, "Recirculation Loop Operating" The licensee proposed to delete Figure 3.4.1-1, "Power versus Flow," and associated references to the figure from the LCO 3.4.1, Actions B, C, D, and F, and SR 3.4.1.2, to revise/renumber Actions E and G, and to add new Condition C with associated Action C1.

The staff has reviewed the proposed changes and finds them acceptable because the manual operator actions specified in TS LCO 3.4.1 (and its associated Conditions B, C, D, and F; Actions B.1, C.1, D.1, F.1, G.1, and G.2; and SR 3.4.1.2) are no longer in use due to the automatic functions provided by the OPRM.

(3) Revise TS Section 5.6.5, "Core Operal:ing Limits Report (COLR)"

The licensee proposed to add: (1) a new TS 5.6.5.a.5 "Oscillation Power Range Monitor (OPRM) Instrumentation;" and (2) a reference was added in TS 5.6.5.b. which is NEDO 32465, "BWR Owners' Group Reactor Stability Detect and Suppress Solutions Licensing Basis Methodology for Reload Applications."

The staff has reviewed the proposed changes and finds them acceptable because NEDO-32465 is an approved licensing topical report to support the new proposed TS 3.3.1.3 for determining the setpoint values of the applicable operating limits for OPRMs in the COLR.

OPRM Instrumentation 3.3.1.3 3.3 INSTRUMENTATION 3.3.1.3 Oscillation Power Range Moritor (OPRM) Instrumentation LCO 3.3.1.3 Four channels of thme OPRM instrumentation shall be OPERABLE within the limits specified in the COLR.

APPLICABILITY: THERMAL POWER > 21.6% RTP.

ACTIONS Separate Condition entry is allowed for each channel.

____-- _ - _ _ - _ _ _ _ _ _ - _ _ - _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ - - _ - _ _ _ _ _ _ - _ _ _ _ - _ - _ _ _ _ -. I- - - - - - - - -

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required A.1 Place channel in 30 days channels inoperable. trip.

OR A.2 Place associated RPS 30 days:

trip system in trip.

OR A.3 Initiate alternate 30 days method to detect and suppress thermal hydraulic instability oscillations.

B. OPRM trip capability B.1 Initiate alternate 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> not maintained. method to detect and suppress thermal hydraulic instability oscillations AND B.2 Restore OPRM trip 120 days capability.

C. Required Action and C.1 Reduce THERMAL POWER 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> associated Completion < 21.6W RTP.

Time not met.

CLINTON 3 .3-14a Amendment No.171

OPRM Instrumentation 3.3.1.3 SURVEILLANCE REQUIREMENTS

---

NOTE-----------------------------

When a channel is placed in an inoperable status solely for performance of required Surveillances, entry into associated Conditions and Required Actions may be delayed for up to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> provided the OPRM maintains trip capability.

SURVEILLaNE FREQUENCY SR 3.3.1.3.1 Perform CHANNEL FUNCTIONAL TEST. 184 days SR 3.3.1.3.2 Calibrate the local power range monitors. 1000 MWD/T average core exposure SR 3.3.1.3.3 ------------------- NOTE--------------------

Neutron detectors are excluded.

Perform CHANNEL CALIBRATION. The setpoints 24 months for the trip function shall be as specified in the COLR.

SR 3.3.1.3.4 Perform LOGIC sys'rEM FUNCTIONAL TEST. 24 months SR 3.3.1.3.5 Verify OPRM is nol bypassed when THERMAL 24 months POWER is Ž 25t RTP and recirculation drive flow is < the value corresponding to 60% of rated core flow.

SR 3.3.1.3.6 ------------------- NOTE--------------------

Neutron detectors are excluded.

Verify the RPS RESPONSE TIME is within 24 months on a limits. STAGGERED TEST BASIS CLINTON 3.3-14b Amendment No. 171

Reporting Requirements 5.6 5.6 Reporting Requirements 5.6.5 CORE OPERATING LIMITS REPORT (COLR)

a. Core operating limits shall be established prior to each reload cycle, or prior to any remaining portion of a reload cycle, and shall be documented in the COLR for the following:

1. LCO 3.2.1, Average Planar Linear Heat Generation Rate (APLHGR),

2. LCO 3.2.2, Minimum Critical Power Ratio (MCPR),

3. LCO 3.2.3, Linear Heat Generation Rate (LHGR),

4. LCO 3.3.1.1, RlPS Instrumentation (SR 3.3.1.1.14), and

5. LCO 3.3.1.3, Oscillation Power Range Monitor (OPRM)

Instrumentation.

b. The analytical methods used to determine the core operating limits shall be those previously reviewed and approved by the NRC in (1) General Electric Standard Application for Reactor Fuel (GESTAR), NEDE-24011-P-A, or (2) NEDO-32465, "EBWR Owners' Group Reactor Stability Detect and Suppress Solutions Licensing Basis Methodology and Reload Applications."

c. The core operating limits shall be determined such that all applicable limits (e.g., fuel thermal mechanical limits, core thermal hydraulic limits, Emergency Core Cooling Systems (ECCS) limits, nuclear limits such as SDM, transient analysis limits, and accident analysis limits) of the safety analysis are met.

d. The COLR, including any midcycle revisions or supplements, shall be provided upon issuance for each reload cycle to the NRC.

(continued)

CLINTON  !,.0-18 AmendmEnt No. 171