ML110620148

From kanterella
Jump to navigation Jump to search

Summary of Meeting with Exelon Generation Company, LLC to Discuss the Request for Additional Information Related to License Amendment Regarding the Ultimate Heat Sink
ML110620148
Person / Time
Site: Byron  Constellation icon.png
Issue date: 03/10/2011
From: Nicholas Difrancesco
Plant Licensing Branch III
To:
DiFrancesco N, NRR/DORL/LPL3-2, 415-1115
References
TAC ME1670, TAC ME1669
Download: ML110620148 (15)
v • d • e


Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 r~arch 10, 2011 LICENSEE: Exelon Generation Company, LLC FACILITY: Byron Station, Unit Nos. 1 and 2

SUBJECT:

SUMMARY

OF MARCH, 1,2011, MEETING WITH EXELON GENERATION COMPANY, LLC, TO DISCUSS THE REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REGARDING THE ULTIMATE HEAT SINK (TAC NOS. ME1669 AND ME1670)

On March 1, 2011, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Exelon Generation Company, LLC via teleconference with NRC staff. The purpose of the meeting was to discuss the development of Technical Specifications (TS) associated with the licensee response to request for additional information (RAI) dated February 14, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML110341352), related to licensee amendment request for Byron Station (Byron), Unit Nos. 1 and 2, to revise the TSs associated with the ultimate heat sink (UHS). A list of attendees is provided as Enclosure 1.

During the meeting, the licensee presented two different positions to the NRC staff:

1. Provided justification to retaining the TS as proposed in letter dated November 8, 2010 (ADAMS Accession No. ML103120556).
2. Proposed revised UHS TS (Enclosure 2) addressing the NRC staff RAI letter dated February 14, 2011.

For position 1, the licensee stated that they preferred to keep the proposed TS from the letter dated November 8,2010, containing Table 3.7.9-1 (which provides the number of operable UHS cooling tower fans required as a function of SX discharge temperature). The licensee provided the following justifications for why the TS with Table 3.7.9-1 were preferred:

1. Similar TSs were approved by the NRC for Vogtle Electric Generating Plant (Vogtle).
2. The operators would be more familiar with the approach using Table 3.7.9-1 as it was similar to the interim table that operators were trained on.
3. Use of Table 3.7.9-1 was more user friendly for a human factor prospective.
4. The TSs were drafted based on guidance from Nuclear Energy Institute (NEI) 01-03, Writer's Guide for the Improved Standard Technical Specifications (ADAMS Accession No. ML020450528)," and specifically referencing Section 4.1.4 (b) as a standard when developing the proposed TS Table 3.7.9-1.

The NRC staff noted that NEI 01-03 has not been endorsed by the NRC and that the Vogtle TS licensing basis is independent of the ongoing Byron review.

- 2 For position 2, the licensee presented a draft TS for the UHS. The TSs had been reformatted to address the NRC staff's RAI question dated February 14, 2011. The NRC staff noted that the draft TS would allow operation with one cooling tower fan inoperable with SX Pump Discharge temperature s 91°F in the Applicable Modes continuously. The NRC staff provided feedback to the licensee on its draft TS are contrary to Generic Letter (GL) 80-30, "Clarification of the Term

'Operable' as it Applies to Single Failure Criterion for Safety Systems Required by Technical Specifications." Specifically, GL 80-30 states, "that entry into action conditions are a temporary relaxation of the single failure criterion." As such, TS constructions that allow continuous operation within an Action Condition is not an acceptable method to write TSs.

The NRC staff asked the licensee if they had considered drafting the TSs in such a way as to not require continuous operation within an Action Condition. The NRC staff illustrated that the TSs could be written to avoid continuous operation within an Action Condition which were also consistent with the Byron's TS, Section 1.0, "Use and Application." This would involve constructing a Condition statement that contains a Note above the number of inoperable cooling tower fans. The number of inoperable cooling tower fans in the Condition would be one more than the maximum allowed number of inoperable cooling tower fans for a given SX Pump Discharge temperature region and the operational configuration of the SX trains. The Note would state "Only applicable when SX Pump Discharge temperature region is> X1 of and s X2 of AND SX Trains are Y." X1 and X2 represent temperatures and Y represents the operational configuration of the SX trains, either split or cross tied. Appropriate associated Required Actions for the given Condition would ensure that; 1) the operable cooling tower fans are capable of being powered by an operable emergency power source and 2) the number of operable cooling tower fans would be restored to at least the minimum number required for a given SX Pump Discharge temperature region and operational configuration of the SX trains.

Appropriate Completion Times for the given Condition would ensure that the Required Actions are completed in an acceptable time.

In summary, no regulatory decisions were made during this meeting. The NRC staff provided feedback to the licensee and illustrated that TSs could be drafted to be consistent with TS Section 1.0, avoid a relaxation of the single-failure criteria considering GL 80-30, and address the human factors concerns successfully.

Members of the public were not in attendance. Public Meeting Feedback forms were not received.

-3 Please direct any inquiries to me at 301-415-1115, or nicholas.difrancesco@nrc.gov.

Nicholas J. DiFrancesco, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-454 and STN 50-455

Enclosures:

1. List of Attendees
2. Licensee Handout - Proposed Draft Ultimate Heat Sink Technical Specifications cc w/encls: Distribution via Listserv

LIST OF ATTENDEES MARCH 1,2011, TELECONFERENCE WITH EXELON GENERATION COMPANY, LLC DISCUSSION OF TECHNICAL SPECIFICATIONS RELATED TO THE STAFF REVIEW OF AN ULTIMATE HEAT SINK AMENDMENT REQUEST G. Purciarello C. Schulten M. Hamm N. DiFrancesco Exelon L. Schofield D. Sargent J. Langan L. Rupert Enclosure 1

UHS 3.7.9 3.7 PLANT SYSTEMS 3.7.9 Ultimate Heat Sink (UHS)

LCO 3.7.9 The UHS shall be OPERABLE.

APPLI CABI LITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQU IRED ACTI ON COMPLETION TIME A. One or more OPERABLE A.l Initiate actions to Immediately cooling tower fanes) operate OPERABLE not running in high cooling tower fanes) speed. in high speed.

AND SX pump discharge temperature> 82°F.

B. One cooling tower fan B.1 Verify OPERABLE 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> inoperable. cooling tower fans are capable of being powered by an OPERABLE emergency power source.

AND B.2 Restore cooling tower 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> fan to OPERABLE status.

OR BYRON - UNITS 1 & 2 3.7.9 1 Amendment .+/-Qi Enclosure 2

UHS 3.7.9 CONDITION REQUIRED ACTION COMPLETION TIt-IE

-NOTE--------

Required Action B.3 can not be utilized when SX trains are split on either Unit.

B.3 Verify SX pump 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> discharge temperature i s ~ 91°F. AND Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter C. Two cooling tower fans C.1 Verify remalnlng 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> inoperable. OPERABLE cooling tower fans are capable of being powered by an OPERABLE emergency power source.

AND C.2 -NOTE--- - -

Required Action C.2 is only applicable when SX tra-j ns are split on either Unit.

Restore two cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fans to OPERABLE status.

OR C.3 Restore one cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fan to OPERABLE status when SX pump discharge temperature is > 84°F and ~ 91°F.

OR BYRON - UNITS 1 &2 3.7.9-2 limendment +/-Qi

UHS 3.7.9 CONDITION REQUIRED ACTION COMPLETION TIME C.4 Restore two cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fan to OPERABLE status when SX pump discharge temperature is > 91°F.

OR

NOTE--------

Required Action C.5 can not be utilized when SX trains are split on either Unit.

C.5 Veri fy SX pump 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> discharge temperature i s ~ 84°F. AND Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter AND C.6 Pl ace OPERABLE cooling tower fans in high speed when SX pump discharge temperature is > 77°F and ~ 8~F.

AND BYRON UNITS 1 &2 3.7.9 - 3 Amendment .we

UHS 3.7.9 CONDITION REQUIRED ACTION COMPLETION TIME

NOTE - _.... -

Required Actions C.7 and C.8 are not applicable when:

a. inoperable fans are powered by separate electrical.

AND

b. Outside wet bulb temperature is

< 76°F.

C.7 Verify remaining 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> OPERABLE cooling tower fans are capable of being powered by an OPERABLE emergency power source.

AND C.8 Restore cooling tower 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> fan configuration such that two inoperable cooling fans are not powered by the same electrical division.

D. Three cooling tower D.1 Verify SX pump 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> fans inoperable. discharge temperature

< 9PF. AND Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter AND BYRON - UNITS 1 &2 3.7.9 - 4 Amendment ~

UHS 3.7.9 CONDITION REQU IRED ACTI ON COMPLETION TIME 0.2 Verify rema-jning 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> OPERABLE cooling tower fans are capable of being powered by an OPERABLE emergency power source.

AND D.3 Restore one cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fan to operable status when SX pump discharge temperature isS 84°F.

OR D.4 Restore two cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fans to operable status when SX pump discharge temperature is > 84°F and S 91°F.

OR D.5 Restore three cool-j ng 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> tower fan to operable status when SX pump discharge temperature is > 9PF.

E. SX pump discharge E.l Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> temperature> 96°F.

AND E.2 Be in Mode 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> F. One or more bas"j n F.l Restore both basin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> level(s) < 60%. levels to ~ 60%.

(contlnued)

BYRON UNITS 1 &2 3.7.9 - 5 Amendment -+/-Ge

ACTIONS (continued)

CONDITION REQU IRED ACTI ON COtvlPLETION TIME G. One Essential Service G.1 Verify basin level 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Water (SX) makeup pump for each tower is inoperable. 2 90%.

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> thereafter AND G.2 Verify OPERABI LITY of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> associated makeup source.

AND G.3 Restore SX makeup 7 days if both pump to OPERABLE units are in status. MODE 1, 2, 3, or 4

AND 14 days if one unit is in MODE 5, 6 or defueled (continued)

BYRON - UNITS 1 &2 3.7.9 6 Amendment +/-4-+/-

ACTIONS (conti nued)

CONDITION REQUIRED ACTION COMPLETION TIME H. Two SX makeup pumps H.l Verify basin level 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> inoperable. for each tower is

~ 90%. AND 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> thereafter AND H.2 Verify OPERABILITY of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at least one makeup source.

AND H.3 Verify OPERABILITY of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> second makeup source.

I. Rock River water level I.l Verify Rock River 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />

~ 670.6 ft Mean Sea water level is Leve 1 (MSl). > 664.7 ft MSL and Hill flow ~ 700 cubic feet per second (cfs). 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter (contlnued)

BYRON - UNITS 1 &2 3.7.9 - 7 Amendment -+/-4+/-

ACTIONS (continued)

CONDITION REQU IRED ACTI ON COMPLETION TIME J. Required Action I not J.l Verify basin level 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> met. for each tower is

~ 90%. AND OR 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Rock River water level thereafter forecast to exceed 702.0 ft MSL by the AND National Weather Service (NWS). J.2 Verify OPERABILITY of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at least one deep OR well pump.

Tornado Watch issued AND by the NWS that includes the Byron J.3 Verify OPERABILITY of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> site. both deep well pumps.

K. Required Action and K.l Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time of Condition A, AND B, C, D, F, G, H, or K not met. K.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> OR UHS inoperable for reasons other than Condition A, B, C, D, F, G, H, or K.

BYRON UNITS 1 & 2 3.7.9 - 8 Amendment +/-4+/-

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.9.1 Verify water level -j n each cool i ng tower 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> basin is ;::: 60%.

- - - - - ----NOTE - - - --- - - - - - 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> OPERABLE cooling tower fans must be operating in high speed when SX pump discharge temperature is > 82°F.

SR 3.7.9.2 Verify essential service water pump discharge water temperature is < 96°F with 8 OPERABLE cooling tower fans.

SR 3.7.9.3 Verify river water level is > 670.6 ft MSL 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and ~ 702.0 ft MSL.

SR 3.7.9.4 Operate each required cooling tower fan on 31 days high speed for;::: 15 minutes.

SR 3.7.9.5 Verify each SX makeup manual, power 31 days operated, and automatic valve in the flow path that is not locked, sealed, or otherwise secured in the open position, is in the correct position.

SR 3.7.9.6 Verify that each SX makeup pump starts on a 31 days simulated or actual low basin level signal and operates for;::: 30 minutes.

(contlnued)

BYRON UNITS 1 &2 3.7.9 9 Amendment -+/-Ga

SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.7.9.7 Verify each diesel driven SX makeup pump 31 days fuel oil day tank level ~ 47%.

SR 3.7.9.8 Cycle each testable valve in the SX makeup 18 months pump flow path through at least one complete cycle of full travel.

SR 3.7.9.9 Verify fuel oil properties are tested in In accordance accordance with and maintained within the with the Diesel limits of the Diesel Fuel on Testing Fuel Oi 1 Program. Testing Program BYRON UN ITS 1 & 2 3.7.9 - 10 Amendment .we

PKG ML110620156 Meeting Notice ML 10450566 Meeting Summary and Handouts ML110620148 OFFICE LPL3-2/PM LPL3-2/LA LPL3-2/BC LPL3-2/PM NAME NDiFrancesco SRohrer RCarlson NDiFrancesco DATE 13/02/11 3/03111 3/10/11 3/10/11

Retrieved from "https://kanterella.com/w/index.php?title=ML110620148&oldid=2551825"