L-PI-20-051, Supplement to Application to Revise Technical Specifications to Adopt TSTF-547, Clarification of Rod Position Requirements
| ML20272A239 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 09/28/2020 |
| From: | Sharp S Xcel Energy |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EPID: L-2019-LLA-0295, L-PI-20-051 | |
| Download: ML20272A239 (27) | |
Text
1717 Wakonade Drive Welch, MN 55089 September 28, 2020 L-PI-20-051 10 CFR 50.90 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant, Units 1 and 2 Docket Nos. 50-282 and 50-306 Renewed Facility Operating License Nos. DPR-42 and DPR-60 Supplement to Application to Revise Technical Specifications to Adopt TSTF-547, "Clarification of Rod Position Requirements" (EPID: L-2019-LLA-0295)
References:
- 1. Letter L-PI-19-041 from NSPM to the NRC, Application to Revise Technical Specifications to Adopt TSTF-547, Clarification of Rod Position Requirements", dated December 23, 2019. (ADAMS Accession No. ML19357A142)
In Reference 1, Northern States Power Company, a Minnesota corporation, doing business as Xcel Energy (hereafter NSPM), requested an amendment to the Technical Specifications (TS) for the Prairie Island Nuclear Generating Plant (PINGP), Units 1 and 2, pursuant to 10 CFR 50.90. Reference 1 included eight site-specific variations, but subsequent internal review identified that two changes denoted in the TS markup pages and clean pages for LCO TS Limiting Condition for Operability (LCO) 3.1.4, Rod Group Alignment Limits, and LCO 3.1.7, Rod Position Indication, provided with Reference 1 were not identified as variations.
This supplement will address those variations as well as provide related editorial corrections to the markups, TS clean pages, and TS Bases markups in the Attachments to this supplement.
Additional Variations The additional variations do not impact the No Significant Hazards Determination or the Environmental Considerations of Reference 1. Further, the two additional variations do not affect the applicability of TSTF-547 or the NRC staff's safety evaluation of the TSTF with respect to the proposed license amendment. NSPM proposes the following two variations in addition to the eight provided with Reference 1:
- PINGP TS LCO 3.1.4 includes a note that is not in the TSTF-547 LCO 3.1.4. This note addresses that a rod position indicator (RPI) may incorrectly indicate misalignment following rod movement until the RPI returns to thermal equilibrium. NSPM proposes to fl Xcel Energy
Document Control Desk Page 2 maintain this note, but to modify it to be consistent with the TSTF and the note added to SR 3.1.4.1 to address time allowed for thermal equilibrium of analog RPls.
PINGP TS LCO 3.1.7 includes a note that is different from the note included in TSTF-547.
This note addresses that an RPI may incorrectly indicate misalignment following rod movement until the RPI returns to thermal equilibrium. Specifically, the note is worded differently and NSPM proposes to use the TSTF-547 version of the note. provides page replacements for the TS page markups provided in Reference 1 for LCO 3.1.4 and LCO 3.1. 7 including removing an erroneous markup of the alignment of one logical connector in TS 3.1.4, Condition B. Attachment 2 provides the revised clean TS pages for LCO 3.1.4 and LCO 3.1. 7 along with the final clean pages for LCO 3.1.5 and LCO 3.1.6. provides two updated pages for the previously provided TS Bases page markups, one each for LCO 3.1.4 and LCO 3.1. 7 (provided for information only).
Please contact Mr. Jeff Kivi at (612) 330-5788 or Jeffrey.L.Kivi@xcelenergy.com if there are any questions or if additional information is needed.
Summary of Commitments This letter makes no new commitments and no revisions to existing commitments.
I declare under penalty of perjury, that the foregoing is true and correct.
Executed on September 28, 2020.
- ~
Scott Sharp Site Vice President, Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota Attachments (3) cc:
Administrator, Region Ill, USNRC Project Manager, Prairie Island, USNRC Resident Inspector, Prairie Island, USNRC State of Minnesota
ATTACHMENT 1 PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 Supplement to Application to Revise Technical Specifications to Adopt TSTF-547, "Clarification of Rod Position Requirements" TECHNICAL SPECIFICATION PAGES (Markup)
Revised LCO 3.1.4 and LCO 3.1.7 (3 Pages Follow)
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 158, 160 Units 1 and 2 3.1.4-1 Unit 2 - Amendment No. 149, 151 3.1 REACTIVITY CONTROL SYSTEMS 3.1.4 Rod Group Alignment Limits.
LCO 3.1.4 All shutdown and control rods shall be OPERABLE.
AND Individual actual rod positions shall be within 24 steps of their group step counter demand position when the demand position is between 30 and 215 steps, or within 36 steps of their group step counter demand position when the demand position < 30 steps, or > 215 steps.
NOTE-----------------------------------------
Individual RPIs may be outside their limits for < 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> following substantial rod movement.
APPLICABILITY:
MODES 1 and 2.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or more rod(s) inoperable.
A.1.1 Verify SDM is within the limits provided in the COLR.
OR A.1.2 Initiate boration to restore SDM to within limit.
AND A.2 Be in MODE 3.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> movement of the associated rods.
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 158 Units 1 and 2 3.1.4-2 Unit 2 - Amendment No. 149 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME B. One rod not within alignment limits.
B.1.1 Verify SDM is within the limits provided in the COLR.
OR B.1.2 Initiate boration to restore SDM to within limit.
AND B.2.1.1 Perform SR 3.2.1.1 and SR 3.2.1.2.
AND B.2.1.2 Perform SR 3.2.2.1.
OR B.2.2 Reduce High Neutron Flux Trip Setpoint to
< 85% RTP.
AND B.3 Verify SDM is within the limits provided in the COLR.
AND 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 8 hours 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />
, and SR 3.2.2.1.
B.4 THERMAL POWER 75 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 158, 160 201 Units 1 and 2 3.1.7-1 Unit 2 - Amendment No. 149, 151 188 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7 Rod Position Indication LCO 3.1.7 The Rod Position Indication (RPI) System and demand position indication shall be OPERABLE.
NOTE-----------------------------------------
Individual RPIs may be outside their limits for < 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> following substantial rod movement.
APPLICABILITY:
MODES 1 and 2.
ACTIONS
NOTE--------------------------------------------------
Separate Condition entry is allowed for each inoperable rod position indicator and each demand position indicator.
CONDITION REQUIRED ACTION COMPLETION TIME A. One RPI per group inoperable for one or more groups.
A.1 Verify the position of the rod(s) with inoperable position indicators by using core power distribution measurement information.
OR A.2 Reduce THERMAL POWER to < 50% RTP.
Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 8 hours RPI RPI indirectly Insert F 3
in Individual RPIs are not required to be OPERABLE for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> following movement of the associated rods.
ATTACHMENT 2 PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 Supplement to Application to Revise Technical Specifications to Adopt TSTF-547, "Clarification of Rod Position Requirements" TECHNICAL SPECIFICATION PAGES (Re-typed)
Revised LCO 3.1.4, LCO 3.1.5, LCO 3.1.6, and LCO 3.1.7 (16 Pages Follow)
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.4-1 Unit 2 - Amendment No. 221 3.1 REACTIVITY CONTROL SYSTEMS 3.1.4 Rod Group Alignment Limits.
LCO 3.1.4 All shutdown and control rods shall be OPERABLE.
AND Individual actual rod positions shall be within 24 steps of their group step counter demand position when the demand position is between 30 and 215 steps, or within 36 steps of their group step counter demand position when the demand position < 30 steps, or > 215 steps.
NOTE--------------------------------------------
Individual RPIs may be outside their limits for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> following movement of the associated rods.
APPLICABILITY:
MODES 1 and 2.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or more rod(s) inoperable.
A.1.1 Verify SDM is within the limits provided in the COLR.
OR A.1.2 Initiate boration to restore SDM to within limit.
AND A.2 Be in MODE 3.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.4-2 Unit 2 - Amendment No. 221 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME B. One rod not within alignment limits.
B.1.1 Verify SDM is within the limits provided in the COLR.
OR B.1.2 Initiate boration to restore SDM to within limit.
AND B.2 Reduce THERMAL POWER to < 75% RTP.
AND B.3 Verify SDM is within the limits provided in the COLR.
AND B.4 Perform SR 3.2.1.1, SR 3.2.1.2, and SR 3.2.2.1.
AND B.5 Re-evaluate safety analyses and determine the THERMAL POWER for which the results remain valid for duration of operation under these conditions.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 72 hours 30 days
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.4-3 Unit 2 - Amendment No. 221 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME C. Required Action and associated Completion Time of Condition B not met.
C.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> D. More than one rod not within alignment limit.
D.1.1 Verify SDM is within the limits provided in the COLR.
OR D.1.2 Initiate boration to restore required SDM to within limit.
AND D.2 Be in MODE 3.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />
Rod Group Alignment Limits 3.1.4 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.4-4 Unit 2 - Amendment No. 221 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.4.1
NOTES--------------------------------
- 1. Not required to be performed for rods associated with inoperable rod position indicator or demand position indicator.
- 2. Not required to be performed until 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after associated rod motion.
Verify position of individual rods within alignment limit.
In accordance with the Surveillance Frequency Control Program SR 3.1.4.2 Verify rod freedom of movement (trippability) by moving each rod, not fully inserted in the core,
> 10 steps in either direction.
In accordance with the Surveillance Frequency Control Program SR 3.1.4.3 Verify rod drop time of each rod, from the fully withdrawn position, is < 1.8 seconds from the beginning of decay of stationary gripper coil voltage to dashpot entry, with:
- a. Tavg > 500°F; and
- b. Both reactor coolant pumps operating.
Prior to reactor criticality after each removal of the reactor head
Shutdown Bank Insertion Limits 3.1.5 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.5-1 Unit 2 - Amendment No. 221 3.1 REACTIVITY CONTROL SYSTEMS 3.1.5 Shutdown Bank Insertion Limits LCO 3.1.5 Each shutdown bank shall be within insertion limits specified in the COLR.
NOTE-----------------------------------------
Not applicable to shutdown banks inserted while performing SR 3.1.4.2.
APPLICABILITY:
MODES 1 and 2.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One shutdown bank inserted 10 steps beyond the insertion limits specified in the COLR.
A.1 Verify all control banks are within the insertion limits specified in the COLR.
AND 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />
Shutdown Bank Insertion Limits 3.1.5 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.5-2 Unit 2 - Amendment No. 221 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. (continued)
A.2.1 Verify SDM is within the limits specified in the COLR.
OR A.2.2 Initiate boration to restore SDM to within limit.
AND A.3 Restore the shutdown bank to within the insertion limits specified in the COLR.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> B. One or more shutdown banks not within limits for reasons other than Condition A.
B.1.1 Verify SDM is within the limits provided in the COLR.
OR B.1.2 Initiate boration to restore SDM to within limit.
AND B.2 Restore shutdown banks to within limits.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />
Shutdown Bank Insertion Limits 3.1.5 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.5-3 Unit 2 - Amendment No. 221 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME C. Required Action and associated Completion Time not met.
C.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.5.1
NOTE ----------------------------
Not required to be performed until 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after associated rod motion.
Verify each shutdown bank is within the limits specified in the COLR.
In accordance with the Surveillance Frequency Control Program
Control Bank Insertion Limits 3.1.6 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.6-1 Unit 2 - Amendment No. 221 3.1 REACTIVITY CONTROL SYSTEMS 3.1.6 Control Bank Insertion Limits LCO 3.1.6 Control banks shall be within the insertion, sequence, and overlap limits specified in the COLR.
NOTE--------------------------------------
Not applicable to control banks inserted while performing SR 3.1.4.2.
APPLICABILITY:
MODE 1, MODE 2 with keff > 1.0.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.
Control bank A, B, or C inserted 10 steps beyond the insertion, sequence, or overlap limits specified in the COLR.
A.1 Verify all shutdown banks are within the insertion limits specified in the COLR.
AND A.2.1 Verify SDM is within the limits specified in the COLR.
OR 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour
Control Bank Insertion Limits 3.1.6 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.6-2 Unit 2 - Amendment No. 221 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. (continued)
A.2.2 Initiate boration to restore SDM to within limit.
AND A.3 Restore the control bank to within the insertion, sequence, and overlap limits specified in the COLR.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 24 hours B. Control bank insertion limits not met for reasons other than Condition A.
B.1.1 Verify SDM is within the limits provided in the COLR.
OR B.1.2 Initiate boration to restore SDM to within limit.
AND B.2 Restore control bank(s) to within limits.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />
Control Bank Insertion Limits 3.1.6 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.6-3 Unit 2 - Amendment No. 221 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME C. Control bank sequence or overlap limits not met for reasons other than Condition A.
C.1.1 Verify SDM is within the limits provided in the COLR.
OR C.1.2 Initiate boration to restore SDM to within limit.
AND C.2 Restore control bank sequence and overlap to within limits.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1 hour 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> D. Required Action and associated Completion Time not met.
D.1 Be in MODE 2 with keff
< 1.0.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />
Control Bank Insertion Limits 3.1.6 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.6-4 Unit 2 - Amendment No. 221 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.6.1 Verify estimated critical control bank position is within the limits specified in the COLR.
Prior to achieving criticality SR 3.1.6.2 -------------------------- NOTE ----------------------------
Not required to be performed until 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after associated rod motion.
Verify each control bank insertion is within the limits specified in the COLR.
In accordance with the Surveillance Frequency Control Program SR 3.1.6.3 -------------------------- NOTE ----------------------------
Not required to be performed until 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after associated rod motion.
Verify sequence and overlap limits specified in the COLR are met for control banks not fully withdrawn from the core.
In accordance with the Surveillance Frequency Control Program
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.7-1 Unit 2 - Amendment No. 221 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7 Rod Position Indication LCO 3.1.7 The Rod Position Indication (RPI) System and demand position indication shall be OPERABLE.
NOTE--------------------------------------------
Individual RPIs are not required to be OPERABLE for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> following movement of the associated rods.
APPLICABILITY:
MODES 1 and 2.
ACTIONS
NOTE--------------------------------------------------
Separate Condition entry is allowed for each inoperable RPI and each demand position indicator.
CONDITION REQUIRED ACTION COMPLETION TIME A. One RPI per group inoperable in one or more groups.
A.1 Verify the position of the rod with inoperable RPI indirectly by using core power distribution measurement information.
OR Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.7-2 Unit 2 - Amendment No. 221 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. (continued)
A.2 Verify the position of the rods with inoperable RPI indirectly by using core power distribution measurement information.
OR 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> AND Once per 31 EFPD thereafter AND 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after discovery of each unintended rod movement AND 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after each movement of rod with inoperable RPI > 12 steps AND Prior to THERMAL POWER exceeding 50%
RTP AND 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after reaching RTP
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.7-3 Unit 2 - Amendment No. 221 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. (continued)
A.3 Reduce THERMAL POWER to < 50% RTP.
8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> B. More than one RPI per group inoperable in one or more groups.
B.1 Place the control rods under manual control.
AND B.2 Monitor and record demand position indication for rods with inoperable RPIs.
AND B.3 Verify, using core power distribution measurement information, position of rods with inoperable RPIs which have been moved in excess of 24 steps in one direction since last determination of their position.
AND B.4 Restore inoperable RPIs to OPERABLE status such that a maximum of one RPI per group is inoperable.
Immediately Once per hour Once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 24 hours
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.7-4 Unit 2 - Amendment No. 221 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME C. One or more demand position indicators per bank inoperable in one or more banks.
C.1.1 Verify by administrative means all RPIs for the affected bank(s) are OPERABLE.
AND C.1.2 Verify the most withdrawn rod and the least withdrawn rod of the affected bank(s) are
< 12 steps apart.
OR C.2 Reduce THERMAL POWER to < 50% RTP.
Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 8 hours D. Required Action and associated Completion Time not met.
D.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />
Rod Position Indication 3.1.7 Prairie Island Unit 1 - Amendment No. 233 Units 1 and 2 3.1.7-5 Unit 2 - Amendment No. 221 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.7.1 -------------------- NOTE-----------------------------------
Not required to be met for RPIs associated with rods that do not meet LCO 3.1.4.
Verify each RPI agrees within 12 steps of the group demand position between 30 and 215 steps, or within 24 steps of the group demand position when the demand position is > 215 steps or < 30 steps.
Once prior to criticality after each removal of the reactor head
ATTACHMENT 3 PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 Supplement to Application to Revise Technical Specifications to Adopt TSTF-547, "Clarification of Rod Position Requirements" TECHNICAL SPECIFICATION BASES PAGES (MARKUP)
FOR INFORMATION ONLY Revised LCO 3.1.4 and LCO 3.1.7 Bases replacement pages (3 Pages Follow)
Rod Group Alignment Limits B 3.1.4 Prairie Island Units 1 and 2 B 3.1.4-6 Revision 242 BASES LCO calculations using rod drive cabinet counters or Pulse to Analog (continued) counters. Individual rod indication may be provided by either the IRPI control board meters or ERCS.
The requirement to maintain the indicated rod alignment to within plus or minus 12 steps of group demand when the group demand position is between 30 and 215 steps accounts for RPI system inaccuracy of +/-5% (approximately 12 steps) of full rod travel. The minimum actual misalignment assumed in safety analysis is 24 steps (15 inches), and in some cases a total misalignment from fully withdrawn to fully inserted is assumed.
Failure to meet the requirements of this LCO may produce unacceptable power peaking factors and LHRs, or unacceptable SDMs, all of which may constitute initial conditions inconsistent with the safety analysis.
This LCO is modified by a Note indicating individual control rod position indications may be outside their limits for up to and including one hour following substantial control rod movement.
This allows up to one hour of thermal soak time to allow the control rod drive shaft to reach thermal equilibrium and thus present a consistent position indication. Substantial rod movement is considered to be 10 or more steps in one direction in less than or equal to one hour.
In accordance with this Note, the comparison of group demand position and RPI may take place at any time up to one hour after rod motion, at any power level. Based on this allowance, rod position may be considered within limits during the thermal soak time to allow position indication to stabilize.
APPLICABILITY The requirements on RCCA OPERABILITY and alignment are applicable in MODES 1 and 2 because these are the only MODES in which neutron (or fission) power is generated, and the of the associated rods
Rod Position Indication B 3.1.7 Prairie Island Units 1 and 2 B 3.1.7-5 Revision 242 BASES LCO (continued)
This LCO is modified by a Note indicating individual control rod position indications may not be within limits for up to and including one hour following substantial control rod movement. This allows up to one hour of thermal soak time to allow the control rod drive shaft to reach thermal equilibrium and thus present a consistent position indication. Substantial rod movement is considered to be 10 or more steps in one direction in less than or equal to one hour.
In accordance with this Note, this comparison of bank demand position and RPI may take place at any time up to one hour after rod motion, at any power level. Based on this allowance, position indication may be considered OPERABLE during the thermal soak time to allow position indication to stabilize.
APPLICABILITY The requirements on the RPI and step counters are only applicable in MODES 1 and 2 (consistent with LCO 3.1.4, LCO 3.1.5, and LCO 3.1.6), because these are the only MODES in which power is generated, and the OPERABILITY and alignment of rods have the potential to affect the safety of the plant. In the shutdown MODES, the OPERABILITY of the shutdown and control banks has the potential to affect the required SDM, but this effect can be compensated for by an increase in the boron concentration of the Reactor Coolant System. See LCO 3.1.1, SHUTDOWN MARGIN (SDM), for SDM requirements in MODE 2 with keff < 1.0 and MODES 3, 4, and 5 and LCO 3.9.1, Boron Concentration, for boron concentration requirements during MODE 6.
of the associated rods
Rod Position Indication B 3.1.7 Prairie Island Units 1 and 2 B 3.1.7-10 Revision 242 BASES SURVEILLANCE SR 3.1.7.1 (continued)
REQUIREMENTS This Surveillance is performed prior to reactor criticality after each removal of the reactor head as there is the potential for unnecessary plant transients if the SR were performed with the reactor at power.
REFERENCES
- 1.
Criteria 12 and 13 of:
Atomic Energy Commission Proposed Rule Making, Part 50 -
Licensing of Production and Utilization Facilities; General Design Criteria for Nuclear Power Plant Construction Permits, Federal Register 32, No. 132 (July 11, 1967): 10213. [NRC Accession Number: ML043310029]
- 2.
USAR, Sections 14.4 and 14.5.
The Surveillance is modified by a Note which states it is not required to be met for RPIs associated with rods that do not meet LCO 3.1.4. If a rod is known to not to be within 12 steps (between 30 and 215 steps) or within 24 steps (when < 30 steps or > 215 steps) of the group demand position, the ACTIONS of LCO 3.1.4 provide the appropriate Actions.