ML22298A011

License Amendment Request to Adopt Technical Specification Task Force TSTF-295-A, Modify Note 2 to Actions of (Post-Accident Monitoring) PAM Table To.

ML22298A011
Person / Time
Site:	Calvert Cliffs, Nine Mile Point
Issue date:	10/25/2022
From:	David Helker Constellation Energy Generation
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
Download: ML22298A011 (1)

Text

200 Exelon Way Kennett Square, PA 19348 www.ConstellationEnergy.com 10 CFR 50.90 October 25, 2022 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318 Nine Mile Point Nuclear Station, Unit 2 Renewed Facility Operating License No. NPF-69 NRC Docket No. 50-410

Subject:

License Amendment Request to Adopt Technical Specification Task Force TSTF-295-A, Modify Note 2 to Actions of [Post-Accident Monitoring] PAM Table to Allow Separate Condition Entry for Each Penetration, Revision 0 In accordance with 10 CFR 50.90, "Application for amendment of license, construction permit, or early site permit," Constellation Energy Generation, LLC (CEG) requests amendments to the Technical Specifications (TS) for Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2 and Nine Mile Point Nuclear Station (NMP), Unit 2.

The proposed changes incorporate the NRC-approved TSTF Improved Standard Technical Specifications Change Traveler TSTF-295-A, Modify Note 2 to Actions of [Post-Accident Monitoring] PAM Table to Allow Separate Condition Entry for Each Penetration, Revision 0.

This change is a clarification to the CCNPP, Units 1 and 2, and NMP, Unit 2 TS which identifies that separate condition entry is allowed for each penetration flow path for the PAM Primary Containment Isolation Valve (PCIV) position indication function. The change also clarifies in the NMP, Unit 2 TS that separate condition entry is allowed for each quadrant for the PAM Suppression Pool Water Temperature indication function.

This request is subdivided as follows.

• Attachment 1 provides an evaluation of the proposed changes.

• Attachment 2a provides the markup of the affected TS pages for CCNPP.

• Attachment 2b provides the markup of the affected TS pages for NMP, Unit 2.

• Attachment 3a provides the markup of the affected Bases pages for CCNPP (for information only).

• Attachment 3b provides the markup of the affected Bases pages for NMP, Unit 2 ( for information only).

The proposed changes have been reviewed by the Plant Operations Review Committees at CCNPP and NMP in accordance with the requirements of the CEG Quality Assurance Program.

License Amendment Request to Adopt TSTF-295-A October 25, 2022 Page 2 CEG requests approval of the proposed amendments by October 25, 2023. Once approved, the amendments shall be implemented within 90 days. This implementation period will provide adequate time for the affected station documents to be revised using the appropriate change control mechanisms.

There are no regulatory commitments contained in this submittal.

In accordance with 10 CFR 50.91, "Notice for public comment; State consultation,"

paragraph (b), CEG is notifying the States of Maryland and New York of this application for license amendments by transmitting a copy of this letter and its attachments to the designated State Officials.

Should you have any questions concerning this submittal, please contact Ms. Wendi E. Para at (267) 533-5208.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 25th day of October 2022.

Respectfully, David P. Helker Sr. Manager - Licensing Constellation Energy Generation, LLC Attachments: 1. Evaluation of Proposed Changes 2a. Proposed Technical Specifications Changes (Mark-Up) - Calvert Cliffs Nuclear Power Plant, Units 1 and 2 2b. Proposed Technical Specifications Changes (Mark-Up) - Nine Mile Point Nuclear Station, Unit 2 3a. Proposed Technical Specifications Bases Pages (For Information Only) -

Calvert Cliffs Nuclear Power Plant, Units 1 and 2 3b. Proposed Technical Specifications Bases Pages (For Information Only) -

Nine Mile Point Nuclear Station, Unit 2 cc: USNRC Region I, Regional Administrator w/ attachments USNRC Senior Resident Inspector, CCNPP USNRC Senior Resident Inspector, NMP USNRC Project Manager, NRR - CCNPP USNRC Project Manager, NRR - NMP S. Seaman, State of Maryland A.L. Peterson, NYSERDA B. Frymire NYSPSC

ATTACHMENT 1 Evaluation of Proposed Changes

Subject:

License Amendment Request to Adopt TSTF-295-A, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration, Revision 0 1.0

SUMMARY

DESCRIPTION 2.0 DETAILED DESCRIPTION 2.1 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 2.2 Nine Mile Point Nuclear Station, Unit 2 2.3 Optional Changes and Variations

3.0 REGULATORY EVALUATION

3.1 Applicability of Published Safety Evaluation 3.2 No Significant Hazards Consideration 3.3 Conclusions

5.0 REFERENCES

License Amendment Request to Adopt TSTF-295-A Page 1 of 5 1.0

SUMMARY

DESCRIPTION Constellation Energy Generation, LLC (CEG), proposes changes to the Technical Specifications (TS), Appendix A of Renewed Facility Operating License Nos. DPR 53 and 69, corresponding to Docket Nos. 50-317 and 50-318, for Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2 (Pressurized Water Reactors (PWRs)), respectively, and Renewed Facility Operating License No. NPF-69, corresponding to Docket No. 50-410 for Nine Mile Point Nuclear Station (NMP),

Unit 2 (Boiling Water Reactor (BWR)).

The proposed changes incorporate NRC-approved Technical Specification Task Force (TSTF)

Improved Standard Technical Specifications Change Traveler TSTF-295-A, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration, Revision 0 (Reference 5.1). The changes provide clarification that separate condition entry is allowed for each penetration flow path for the Post-Accident Monitoring (PAM) Primary Containment Isolation Valve (PCIV) position indication function (all PWR and BWR plants) and for each suppression pool water temperature indication function (BWR plants only).

2.0 DETAILED DESCRIPTION NRC-approved TSTF Traveler TSTF-295-A, Revision 0, modifies all Improved Standard Technical Specifications (ISTS) to clarify that a separate Condition entry is allowed for each penetration flow path for the PAM instrumentation PCIV indication function. This change is applicable to all PWR and BWR plants (NUREGs-1430 through 1434), including CCNPP, Units 1 and 2, and NMP, Unit 2.

The PAM specification requires a minimum of one channel of PCIV position indication be operable for each active PCIV in a containment penetration flow path. This change enhances the existing TS Note which states, Separate Condition entry is allowed for each function, by clarifying that each penetration flow path should be evaluated separately for Operability of the PAM function. The change reduces the potential for a shutdown of the unit due to misinterpretation of the requirements.

TSTF-295-A also modifies the BWR-only Improved Technical Specifications to clarify that a separate Condition entry is allowed for each suppression pool quadrant water temperature indication function. This change is applicable to BWR plants only (NUREGs-1433 and 1434),

including NMP, Unit 2.

The PAM specification requires a minimum of two channels of suppression pool quadrant water temperature indication be operable. This change enhances the existing TS Note which states, Separate Condition entry is allowed for each function, by clarifying that each suppression pool quadrant should be evaluated separately for Operability of the PAM function. The change also reduces the potential for a shutdown of the unit due to misinterpretation of the requirements.

The current TS Actions provide appropriate compensatory actions for each inoperable indication function. The proposed changes do not impact any existing TS Actions or Requirements.

License Amendment Request to Adopt TSTF-295-A Page 2 of 5 The detailed site-specific changes are described below.

2.1 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 The TS Actions Note states Separate Condition entry is allowed for each Function. The change clarifies that separate condition entry is allowed for each penetration flow path for the PAM PCIV position indication function. Specifically, the proposed change in the CCNPP TS revises Table 3.3.10-1, Post-Accident Monitoring Instrumentation, by prefacing the title of Function 8, Containment Isolation Valve Position, with the phrase Penetration Flow Path.

A corresponding change to the Bases was made to add the following statement: Each penetration is treated separately and each penetration flow path is considered a separate function. Therefore, separate Condition entry is allowed for each inoperable penetration flow path.

2.2 Nine Mile Point Nuclear Station, Unit 2 The TS Actions Note states Separate Condition entry is allowed for each Function. The changes clarify that separate condition entry is allowed for each penetration flow path for the PAM PCIV position indication function and for each suppression pool quadrant temperature indication. The proposed changes in the NMP, Unit 2 TS revises Table 3.3.3.1-1, Post Accident Monitoring Instrumentation, by (1) prefacing the title of Function 8, PCIV Position, with the phrase Penetration Flow Path, and (2) modifying the title of Function 9, to be Suppression Pool Quadrant Water Temperature.

Corresponding changes to the Bases were made to clarify the connection between the existing Function 8, Penetration Flow Path, Automatic PCIV Position, and Function 9, Suppression Pool Quadrant Water Temperature, with the TS Action Note referenced above. Specifically, the following statements were added to the listed Functions in Section 3.3.3.1:

Function 8, Penetration Flow Path, Automatic PCIV Position, Each penetration is treated separately and each penetration flow path is considered a separate function. Therefore, separate Condition entry is allowed for each inoperable penetration flow path.

Function 9, Suppression Pool Quadrant Water Temperature Each suppression pool water temperature quadrant is treated separately and each quadrant is considered to be a separate function. Therefore, separate Condition entry is allowed for each inoperable quadrant.

2.3 Optional Changes and Variations The changes proposed to the TS of CCNPP, and NMP, Unit 2 are consistent with the changes made to the ISTSs by TSTF-295-A, Revision 0. Detailed below are the administrative variations from the TSTF Traveler compared with the proposed TS changes. The variations are due to individual TS numbering and language. The variations do not affect the applicability of the proposed license amendments to the changes set forth in TSTF-295-A, Revision 0 or the NRC staff's associated approval letter (Reference 5.2).

License Amendment Request to Adopt TSTF-295-A Page 3 of 5 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Variation is due to individual TS Function numbering. The variation is highlighted by bold type below:

Change made to the CEOG STSs Proposed Change to CCNPP TS (NUREG-1432) by TSTF-295-A

1. Revises Table 3.3.11-1, Post Accident Revises Table 3.3.10-1, Post-Accident Monitoring Instrumentation, by prefacing Monitoring Instrumentation, by prefacing the title of Function 8, Containment the title of Function 8, Containment Isolation Valve Position, with the phrase Isolation Valve Position, with the phrase Penetration Flow Path. Penetration Flow Path.

2. Corresponding changes to TS Bases Corresponding changes to TS Bases Section 3.3.11, Function 8 Section 3.3.10, Function 8 Nine Mile Point Nuclear Station, Unit 2 Variations are due to individual TS numbering and language. The variations are highlighted by bold type below:

Change made to the BWR-6 STSs Proposed Change to NMP, Unit 2 TS (NUREG-1434) by TSTF-295-A

1. Revises Table 3.3.3.1-1, Post Accident Revises Table 3.3.3.1-1, Post Accident Monitoring Instrumentation, by prefacing Monitoring Instrumentation, by prefacing the title of Function 8, Containment the title of Function 8, PCIV Position, Isolation Valve Position, with the with the phrase Penetration Flow Path.

phrase Penetration Flow Path.

2. Revises Table 3.3.3.1-1, Post Accident Revises Table 3.3.3.1-1, Post Accident Monitoring Instrumentation, by prefacing Monitoring Instrumentation, by revising the title of Function 13, Suppression the title of Function 9 to state, Pool Water Temperature with the Suppression Pool Quadrant Water indication location. Temperature where the suppression pool quadrant is the indication location.

3. Corresponding changes to TS Bases Corresponding changes to TS Bases Section 3.3.3.1, Functions 8 and 13 Section 3.3.3.1, Functions 8 and 9

3.0 REGULATORY EVALUATION

3.1 Applicability of Published Safety Evaluation TSTF-295-A, Revision 0 (Reference 5.1) was approved by the NRC in a letter dated December 21, 1999 (Reference 5.2). CEG has reviewed the letter provided to the TSTF as well as the information provided in TSTF-295-A. CEG has concluded that the justifications presented in TSTF-295-A and the approval letter prepared by the NRC staff are applicable to Calvert Cliffs Nuclear Power Plant, Units 1 and 2, and Nine Mile Point Nuclear Station, Unit 2 and justify the proposed amendments for incorporation into the associated Technical Specifications.

License Amendment Request to Adopt TSTF-295-A Page 4 of 5 3.2 No Significant Hazards Consideration Constellation Energy Generation, LLC (CEG), proposes changes to the Technical Specifications (TS), Appendix A of Renewed Facility Operating License Nos. DPR 53 and 69, corresponding to Docket Nos. 50-317 and 50-318, for Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2 Pressurized Water Reactors (PWRs), respectively, and Renewed Facility Operating License No.

NPF-69, corresponding to Docket No. 50-410 for Nine Mile Point Nuclear Station (NMP), Unit 2 Boiling Water Reactor (BWR).

The proposed changes incorporate NRC-approved Technical Specification Task Force (TSTF)

Improved Standard Technical Specifications Change Traveler TSTF-295-A, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration, Revision 0 (Reference 5.1). The proposed changes provide clarification that separate condition entry is allowed for each penetration flow path for the Post-Accident Monitoring (PAM) Primary Containment Isolation Valve (PCIV) position indication function (all PWR and BWR plants) and for each suppression pool quadrant water temperature indication function (BWR plants only).

CEG has evaluated whether or not a significant hazards consideration is involved with the proposed amendments by focusing on the three standards set forth in 10 CFR 50.92, "Issuance of amendment," as discussed below:

1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?

Response: No.

The proposed changes provide clarification that separate condition entry is allowed for each penetration flow path for the PAM PCIV position indication function (all PWR and BWR plants) and for each Suppression Pool Quadrant Water Temperature indication function (BWR plants only). The proposed changes do not affect any plant equipment, test methods, or plant operation, and are not initiators of any analyzed accident sequence. The actions taken for inoperable PAM channels are not changed. Operation in accordance with the proposed TS will ensure that all analyzed accidents will continue to be mitigated as previously analyzed.

Therefore, the proposed changes do not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed change create the possibility of a new or different kind of accident from any accident previously evaluated?

Response: No.

The proposed changes provide clarification that separate condition entry is allowed for each penetration flow path for the PAM PCIV position indication function (all PWR and BWR plants) and for each Suppression Pool Quadrant Water Temperature indication function (BWR plants only). The proposed changes do not involve a physical alteration to the plant (i.e., no new or different type of equipment will be installed) or a change to the methods governing normal plant operation. The changes do not alter the assumptions made in the safety analysis.

License Amendment Request to Adopt TSTF-295-A Page 5 of 5 Therefore, the proposed changes do not create the possibility of a new or different kind of accident from any previously evaluated.

3. Does the proposed change involve a significant reduction in a margin of safety?

Response: No.

The proposed changes provide clarification that separate condition entry is allowed for each penetration flow path for the PAM PCIV position indication function (all PWR and BWR plants) and for each Suppression Pool Quadrant Water Temperature indication function (BWR plants only). The proposed changes will not affect the operation of plant equipment or the function of any equipment assumed in the accident analysis. The PAM channels will continue to be operable or the existing, appropriate actions will be followed.

Therefore, the proposed changes do not involve a significant reduction in a margin of safety.

3.3 Conclusions Based on the above, CEG concludes that the proposed amendments present no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and, accordingly, a finding of "no significant hazards consideration" is justified.

4.0 ENVIRONMENTAL CONSIDERATION

The proposed changes would revise a requirement with respect to installation or use of a facility component located within the restricted area, as defined in 10 CFR 20, or would change an inspection or surveillance requirement. However, the proposed changes do not involve (i) a significant hazards consideration , (ii) a significant change in the types or significant increase in the amounts of any effluents that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed changes meet the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed changes.

5.1 REFERENCES

5.2 TSTF-295-A, Revision 0, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration, dated July 10, 1998, ADAMS Accession No. ML040620189 5.3 Letter dated December 21, 1999, W.D. Beckner (NRC) to J. Davis (NEI), ADAMS Accession No. ML993630256

ATTACHMENT 2a Markup of Technical Specifications Pages Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318 Revised Technical Specifications Page 3.3.10-4

PAM Instrumentation 3.3.10 Table 3.3.10-1 (page 1 of 2)

Post-Accident Monitoring Instrumentation CONDITIONS REQUIRED REFERENCED FROM INDICATION REQUIRED ACTION FUNCTION CHANNELS D.1

1. Wide Range Logarithmic Neutron Flux 2 E

2. Reactor Coolant Outlet Temperature 2 E

3. Reactor Coolant Inlet Temperature 2 E

4. RCS Subcooled Margin Monitor 1 N/A

5. Reactor Vessel Water Level 2 F

6. Containment Water Level (wide 2 E range)

7. Containment Pressure 2 E

8. Containment Isolation Valve 2 per E Position penetration (a)(b)

Penetration Flow Path flow path

9. Containment Area Radiation (high 2 F range)

10. Pressurizer Pressure (wide range) 2 E E

11. Steam Generator Pressure 2 per steam generator

12. Pressurizer Level 2 E

13. Steam Generator Water Level (wide 2 per steam E range) generator CALVERT CLIFFS - UNIT 1 3.3.10-4 Amendment No. 274 CALVERT CLIFFS - UNIT 2 Amendment No. 251

ATTACHMENT 2b Markup of Technical Specifications Pages Nine Mile Point Nuclear Station, Unit 2 Renewed Facility Operating License No. NPF-69 NRC Docket No. 50-410 Revised Technical Specifications Page 3.3.3.1-4

PAM Instrumentation 3.3.3.1 Table 3.3.3.1-1 (page 1 of 1)

Post Accident Monitoring Instrumentation CONDITIONS REFERENCED REQUIRED FROM REQUIRED FUNCTION CHANNELS ACTION D.1

1. Reactor Vessel Pressure 2 E

2. Reactor Vessel Water Level

a. Fuel Zone Range 2 E

b. Wide Range 2 E

3. Suppression Pool Water Level

a. Narrow Range 2 E

b. Wide Range 2 E

4. Drywell Pressure

a. Narrow Range 2 E

b. Wide Range 2 E

5. Drywell Radiation (High Range) 2 F

6. Drywell Air Temperature 2 E

7. Suppression Chamber Pressure 2 E

8. PCIV Position 2 per penetration E Penetration Flow Path flow path(a)(b)

9. Suppression Pool Water Temperature 2(c) E Quadrant (a) Not required for isolation valves whose associated penetration flow path is isolated by at least one closed and de-activated automatic valve, closed manual valve, blind flange, or check valve with flow through the valve secured.

(b) Only one position indication channel is required for penetration flow paths with only one installed control room indication channel.

(c) Monitoring each suppression pool quadrant.

NMP2 3.3.3.1-4 Amendment 91, 124

ATTACHMENT 3a Markup of Technical Specifications Bases Pages (For Information Only)

Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318 Revised Technical Specifications Bases Page B 3.3.10-6

PAM Instrumentation B 3.3.10 BASES the containment flood level and utilize sealed reference legs to sense water level.

7. Containment Pressure (wide range) Monitor The containment pressure monitor is provided for verification of RCS and containment OPERABILITY.

Containment pressure instrumentation consists of three containment pressure transmitters with overlapping ranges that provide input to control room indicators.

The trans~itters are located outside the Containment and are nbt subject to a harsh environment.

Penetration Flow Path

8. CIV Position Indicator Containment isolation valve position indicators are provided for verification of containment OPERABILITY and integrity.

In the case of CIV position, the important information is the isolation status of the containment penetration.

The LCO requires one channel of valve position indication in the Control Room to be OPERABLE for each active CIV in a containment penetration flow path, i.e., two total channels of CIV position indication for a penetration flow path with two active valves. For containment penetrations with only one active CIV having control room indication, Note (b) requires a single channel of valve position indication to be OPERABLE. This is sufficient to redundantly verify the Each penetration is treated isolation status of each isolable penetration via separately and each indicated status of the active valve, as applicable, penetration flow path is and prior knowledge of passive valve or system boundary considered a separate status. If a penetration flow path is isolated, function. Therefore, separate position indication for the CIV(s) in the associated Condition entry is allowed for penetration flow path is not needed to determine each inoperable penetration status. Therefore, the position indication for valves flow path. in an isolated penetration flow path is not required to be OPERABLE.

The CIV position PAM instrumentation consists of ZL-505, 506, 515, 516, 2080, 2180, 2181, 3832, 3833, 4260, 5291, 5292, 6900, and 6901 (Reference 5).

CALVERT CLIFFS - UNITS 1 & 2 B 3.3.10-6 Revision 19

ATTACHMENT 3b Markup of Technical Specifications Bases Pages (For Information Only)

Nine Mile Point Nuclear Station, Unit 2 Renewed Facility Operating License No. NPF-69 NRC Docket No. 50-410 Revised Technical Specifications Bases Pages B 3.3.3.1-6 B 3.3.3.1-7

PAM Instrumentation B 3.3.3.1 BASES LCO 7. Suppression Chamber Pressure (continued)

Suppression chamber pressure is a Category I variable provided to determine whether or not reactor depressurization or venting of the primary containment will be required. Suppression chamber pressure is monitored in the control room from two separate pressure transmitters and is continuously displayed on a recorder and an indicator.

The range is from 0 psig to 150 psig. These instruments are the primary indication used by the operator during an accident. Therefore, the PAM Specification deals specifically with this portion of the instrument channel.

Penetration Flow Path

8. Primary Containment Isolation Valve (PCIV) Position PCIV (excluding check valves) position is a Category I variable provided for verification of containment integrity.

In the case of PCIV position, the important information is the isolation status of the containment penetration. The LCO requires one channel of valve position indication in the control room to be OPERABLE for each active PCIV in a containment penetration flow path, i.e., two total channels of PCIV position indication for a penetration flow path with two active valves. For containment penetrations with only one active PCIV having control room indication, Note (b) requires a single channel of valve position indication to be Each penetration is treated OPERABLE. This is sufficient to verify redundantly the separately and each isolation status of each isolable penetration via indicated penetration flow path is status of the active valve, as applicable, and prior considered a separate knowledge of passive valve or system boundary status. If a function. Therefore, separate penetration is isolated, position indication for the PCIV(s)

Condition entry is allowed for in the associated penetration flow path is not needed to determine status. Therefore, the position indication for each inoperable penetration valves in an isolated penetration is not required to be flow path. OPERABLE (Note (a)).

The indication for each PCIV is provided at the valve controls in the control room. Each indication consists of green and red indicator lights that illuminate to indicate whether the PCIV is fully open, fully closed, or in a mid-position. Therefore, the PAM Specification deals specifically with this portion of the instrumentation channel.

(continued)

NMP2 B 3.3.3.1-6 Revision 0

PAM Instrumentation B 3.3.3.1 BASES Quadrant LCO 9. Suppression Pool Water Temperature (continued)

Suppression pool water temperature is a Type A and Category I variable provided to detect a condition that could potentially lead to containment breach, and to verify the effectiveness of ECCS actions taken to prevent containment breach. The suppression pool water temperature instrumentation allows operators to detect trends in suppression pool water temperature in sufficient time to take action to prevent steam quenching vibrations in the suppression pool. Eight temperature sensors are arranged in four groups of two independent and redundant channels, located such that there is one group of sensors in each quadrant of the suppression pool. The range of the Each suppression pool suppression pool water temperature channels is from 50ºF to water temperature 250ºF.

quadrant is treated separately and each Thus, four groups of sensors are sufficient to monitor the bulk quadrant is considered average temperature of the suppression pool. The outputs for the to be a separate PAM sensors are monitored on an indicator and two recorders in the control room. One group of sensors provides input only to an function. Therefore, indicator while the other group of sensors provides input to both an separate Condition entry indicator and two recorders, but only the two recorders are required is allowed for each for this group. Both the indicator and the two recorders must be inoperable quadrant. OPERABLE to furnish two channels of PAM indication for each quadrant of the suppression pool. A selector switch is available for the indicator and a different pen recorder for each sensor is available for the two recorders so that each sensor can be monitored. The indicator and recorders are the primary indication used by the operator during an accident. Therefore, the PAM Specification deals specifically with this portion of the instrument channels.

(continued)

NMP2 B 3.3.3.1-7 Revision 0, 7 (A102), 25 (A124)