Text

Response to NRC Generic Letter 2008-01, Response to Requests for Additional Information
	ML093480120
Person / Time
Site:	Hatch
Issue date:	12/14/2009
From:	Ajluni M; Southern Nuclear Operating Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	GL-08-001, NL-09-1803
	Download: ML093480120 (16)
	v • d • e

Southern Nucieat Operating Company, Inc SOUTHERN A COMPANY December 14, 2009 Docket 50-321 U. S. Nuclear Regulatory ATTN: Document Control Washington, D. C.

Edwin I. Hatch Nuclear Response to NRC Generic Letter Response to Requests for Additional Ladies and Gentlemen:

On October 10, 200B (NL-OB-1340)

SNC submitted the nine-month response Generic Letter 2008-01 and on August 24, 2009 (NL-09-1 067) SNC submitted for Edwin I Hatch Nuclear Plant(HNP)

Unit 2 post-outage response to Regulatory Commission (NRC) Generic Letter 2008-01. In a letter dated 5, 2009 the NRC submitted a request for additional information concerning the response referenced above. The requested response date was 45 days from calendar date of the The enclosure to this letter contains the SNC response to the referenced request for additional This letter contains an NRC commitment.

u.s Nuclear Regulat01Y Page Mr. M. J. Ajluni states he is Nuclear Licensing Manager of Southern Nuclear Operating Company, is authorized to execute this oath on behalf of Southern Nuclear Operating Company and to the best of his knowledge and belief, the facts set forth in this letter are true. If you have any questions, please advise. Sincerely, M. J. Manager, Nuclear Sworn to and subscribed before me this -LL day of

,2009.

Notary Public My commission expires: ///0 t.//J.o13 MJA/PAHliac

Enclosures:

1. RAI Responses to NRC. 2. Regulatory Commitment for Submitting TS Change after TSTF Approval by NRC. 3. Attachments 1,2, and 6 of 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems."

U.S Nuclear Regulatory Commission NL-09-1803 Page 3 Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. D. R. Madison, Vice President Hatch Ms. P. M. Marino, Vice President Engineering RTYPE: CHA02.004 U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Ms. D. N. Wright, NRR Project Manager Hatch Mr. E. D. Morris, Senior Resident Inspector

-Hatch Edwin I Hatch Nuclear Response to NRC Generic letter Response to Requests for Additional Enclosure RAI Responses to Enclosure RAJ Responses to REQUEST FOR ADDITIONAL Guidance on Nuclear Regulatory Commission (NRC) staff expectations is provided by Reference 1 which is generally consistent with Nuclear Energy Institute (NEI) guidance provided to industry in Reference 2 as clarified in later NEI communications.

The NRC staff recommends that the licensee consult Reference 1 when responding to the following RAls: 1. Provide a regulatory commitment and a schedule for applying the Technical Specification Task Force (TSTF) process to any Technical Specification (TS) changes resulting from GL 2008-01. Response:

SNC has provided a regulatory commitment in Enclosure 2 to review any TSTF issued by the NRC concerning gas intrusion.

SNC will either submit a technical specification change based on the TSTF or submit a plant specific technical specification change for Plant Hatch within a year after the issuance of an NRC approved TSTF concerning gas intrusion.

2. SNC letter dated August 24, 2009 states that the procedure, 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems" was implemented on November 19, 2008. The NRC staff requests the following additional information relative to this procedure:

a) Summarize the monitored locations along with the associated surveillance methods: Response:

Details for monitoring method and frequency along with point details for each monitoring location are provided in 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems," Attachments 1,2, and 6. A copy of these attachments is included as Enclosure

3. b) Discuss the surveillance intervals for the monitored locations, including justifications for surveillance intervals greater than a month; Response:

The applicable system piping was reviewed as per Generic Letter 2008-01 and critical locations were identified where voids could accumulate and the venting process could be challenged.

The review concluded that none of the critical locations have active gas accumulation mechanisms.

The Hatch Monitoring Program is focused around these critical locations.

The monitoring takes credit for the monthly activity that is performed by Operations as per the Technical Specification surveillance for venting of ECCS systems. The program also takes credit for dynamic flushing that occurs as a result of the quarterly ECCS flow surveillances.

All of the monitored locations are vented or dynamically flushed anytime that the section of piping is drained such as for maintenance activities.

Confirmatory UT inspections are performed on some locations to ensure the venting or flushing was successful.

The surveillance intervals for the monitored locations are contained in Attachments 1 and 2 of Enclosure

3. Justification for frequencies longer than monthly are based on the lack of an active gas accumUlation mechanism, dynamic flushing as a result of quarterly flow surveillances, and confirmatory UT inspections are performed on some locations to ensure the venting or flushing was successful.

E1-1 Enclosure RAI Responses to Procedure, 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems" provides an allowance to modify this frequency based on the results of previous gas monitoring results. If a void is identified during the routine monitoring, the frequency is evaluated to determine if an increase (or shorter monitoring period) is warranted.

c) Provide the surveillance criteria.

The surveillance acceptance criteria are specified in 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems," Attachments 1,2, and 6. A copy of these attachments is included as Enclosure

3. d) Discuss actions to be taken if surveillance criteria are not met. Response:

Plant procedure, 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems," requires that for any identified voids that exceed the allowable size, a condition report is initiated and the Operations Shift Manager and/or the Shift Supervisor is immediately notified.

If any voids are identified at any monitoring point that does not have an approved maximum allowable limit, either a formal evaluation will be performed or the void will be removed by venting or flushing.

The impact on system operability will be addressed as a result of normal processing of the condition report by the on-shift operations personnel.

In addition, Engineering personnel are immediately notified to perform an evaluation.

e) State whether all voids identified will be quantified, recorded, and entered into the Corrective Action Program (CAP). Response:

Per plant procedure, 42EN-MON-001-0, "Monitoring and Trending of Gas Accumulation in Safety Injection Systems," all identified voids, including the measured size, are recorded in a data package and a condition report generated to enter the information into the Corrective Action Program. 3. Describe any process improvements made to guard against gas intrusion due to inadvertent draining, system realignments, incorrect maintenance procedures, or other evolutions.

Plant evolutions involving system re-alignment or specific component manipulation that could result in inadvertent draining or inadvertent gas intrusion are controlled by plant procedures and performed only by trained plant staff. This includes system draining, tagouts, and system restoration fill and vent activities.

The HNP plant procedures applicable to these evolutions (Operations, Maintenance, and Instrument and Controls) were independently reviewed for improvements that could be made to address issues related to Generic Letter 2008-01. The review included such areas as vent scope, proper system vent sequence, precautions and limitations, potential gas accumulation mechanisms, documentations of voids identified, etc. From this review, resulting recommendations were evaluated by the plant staff and incorporated into the procedures as deemed appropriate.

Simplified piping elevation drawings were created as aids to be used by Operations and Engineering personnel to develop vent and/or ultrasonic testing (UT) plans. E1-2 Enclosure RAI Responses to Additional vents have been added in Hatch Unit 2 piping locations that were determined not to have adequate venting capability.

Vents will be added to Hatch Unit 1 in similar locations during the Spring 2010 refueling outage. Operations, maintenance, and engineering personnel have been trained on the issues related to gas accumulation, including the potential causes and impact. This training also included the procedural changes described above. 4. Training was not identified in the GL but is considered to be a necessary part of applying procedures and other activities when addressing the issues identified in the GL Briefly discuss training.

Response:

Training on Gas Accumulation and Management has been provided into the HNP continuing training process and provided to Operations and Maintenance personnel as part of the response to INPO SER 02-05, "Gas Intrusion in Safety Systems." This training focused on the potential for gas accumulation mechanisms and negative impact of voiding on system performance and reliability.

Several Operations and Engineering procedures have been developed or revised as a result of the response activities to Generic Letter 2008-01. When any station procedure is modified, an assessment for training needs and change management is required in accordance with HNP procedure DI-TRN-61-1006, "Training Request Worksheet." In addition, selected site personnel have been trained and qualified on the use of UT equipment to perform void detection.

SNC is an active participant in the NEI Gas Accumulation Team, which is currently coordinating with the Institute of Nuclear Power Operations in the development of generic training modules for gas accumulation and management.

These training modules target the Engineering, Operations, and Maintenance disciplines.

The first module has been received by HNP and will be evaluated in the first quarter of 2010 for incorporation into the site personnel training processes in a version tailored to meet the station needs as per 61-1006, "Training RequestWorksheef." As the remainder of the training modules are completed and become available to the industry, SNC will evaluate them for applicability to HNP. Pending release of remaining products.

the schedule for such planned training has not yet been determined.

REFERENCES Ruland, William H., "Preliminary Assessment of Responses to Generic Letter 2008-01, Managing Gas Accumulation in emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems, i and Future NRC Staff Review Plans," NRC letter to James H. Riley, Nuclear Energy Institute, ML091390637, May 28,2009. Riley, James H., "Generic Letter (GL) 2008-01 , "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Contain Spray Systems Evaluation and 3 Month Response Template," Letter to Administrative Points of Contact from Director, Engineering Nuclear Generation Division, Nuclear Energy Institute, Enclosure 2, "Generic Letter 2008-01 Response Guidance," March 20, 2008. E1-3 Edwin I Hatch Nuclear Response to NRC Generic letter Response to requests for Additional Enclosure Regulatory Enclosure RAJ Responses to NRC Commitment Type Scheduled One-Time Action Completion Date SNC will either submit X Within one year after a technical NRC Issuance specification based on the TSTF or submit a plant specific technical specification change for Plant Hatch within a year after the issuance of an NRC approved TSTF concerning gas intrusion.

Edwin I Hatch Nuclear Response to NRC Generic letter Response to requests for Additional 2EI\I-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1 , 2 and

Enclosure 42EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1, 2 and 6 Monitor Point # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 System 1E11 1 E11 1 E11 1E11 1E11 1 E11 1E11 1E11 1E11 1 E11 1E11 1E11 1 E11 1E11 1E11 1E11 1 E11 1E11 1E11 1E11 1 E11 P&IO H16329 H16329 H16329 H16329 H16329 H16329 H16329 H16330 H16330 H16330 H16330 H16330 H16330 H16330 H16330 H16330 H16329 H16329 H16329 H16329 H16329 Westinghouse One Line DWQ 10036099 10036099 10036099 10036099 10036099 10036099 10036099 10036003 10036003 10036003 10036003 10036003 10036003 10036003 10036003 10036003 10037019 10037019 10037019 10037019 10037019 One Line Location 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 1 2 3 4 5 --------------,-----c------

Max Pipe Allowable 00 Pipe 10 Floor Access Monitoring Monitoring Void Size Room Description Vent Valves [in] [in]

Isometric EI Line EI Needs Insulated Method Frequency

[Cu. Ft.] Questions/Comments F067 SOC SYSTEM DRYWELL SUCTION TBD 20.00 19.000 S01286 TBD 156'-6" TBD Y VENT DRAIN TBD FPCHX SYSTEM SPECTACLE FLANGE ROOM FPC SUCTION TBD 8.625 7.981 S00236 158' 186' NONE N UT DRAIN TBD ABOVE PUMP SIDE NE DIAG F006D TBD 20.00 19.000 S01211 95' 106' TBD Y UT DRAIN PUMP SIDE NE DIAG F006B TBD 20.00 19.000 S01259 95' 106' TBD Y UT DRAIN F083 FLUSH TBD SUPPLY SOC TBD 1.050 0.742 SOO060 130' 136'-11" TBD Y VENT DRAIN COMMON SOC TORUS SUCTION TBD 20.00 19.000 123'-4" TBD Y UT DRAIN F008TO F009 SYSTEM F008 IN DRYWELL ACCESS; DRYWELL SOC NONE 20.00 19.000 SOO033 130' 135' NONE Y VENT DRAIN TBD F009 IN DRYWELL F016ACONT ATTACH OUTSIDE MG SET ROOMS 6(3)RX BLDG SPRAY O/B Y 16.00 15.250 SOO037 158' 160' NONE Y VENT MONTH ON om F010 FLUSH SYSTEM ATTACH EAST WALL INTO 6(3)ACCESS SUPPLY Y 4.500 4.026 SOO052 130' 137' SCAFF Y UT DRAIN om F010 FLUSH SYSTEM ATTACH EAST WALL INTO 6(3)ACCESS SUPPLY Y 4.500 4.026 SOO052 130' 137' SCAFF Y UT DRAIN om FLUSHI SYSTEM 6(3)ACCESS TBD 20.00 19.000 S01184 130' 138'-9" TBD Y UT DRAIN TOP OF DRYWELL PUMP SIDE SE DIAG F006A TBD 20.00 19.000 SOO034 95' 97' TBD Y UT DRAIN TBD F006A ON GRATING RHR AHX STEAMCOND UTI DRAINI SE DIAG (CAPPED) TBD 20.00 19.000 SOO036 118' 122'-6" NONE Y FLUSH(1) QUARTER 6(3) BACK CORNER ATTACH INVERTED "U" AT 6(3)SE DIAG UIS F048A Y 20.00 19.000 SOO036 107' 116'-1 " SCAFF Y FLUSH QUARTER CONFLUENCE OF "A" & PUMP SIDE SE DIAG F006C NONE 24.00 22.876 SOO034 107' 113' NONE Y UT DRAIN TBD BEHIND SE DIAG D005A TBD 20.00 19.000 SOO036 95' 104'-1" SCAFF Y FLUSH QUARTER TBD ABOVE MOTORS ON CAP ON COND Y -GOES ATTACH ISO SHOWS VENT AT 193', 6(3)RX BLDG MAKEUP TOINSTR 4.500 4.026 SOO054 185' 193' NONE N VENT MONTH TOP 2" CAN'T BE VENTED -----------FPCHX SYSTEM ATTACH BELOW SPECTACLE 6(3)ROOM TO FPC N 8.625 7.981 SOO054 185' 185' NONE N UT DRAIN F016B TO Y-HARD 146'-SYSTEM 6(3)RX BLDG F021B PIPED 16.00 15.250 S01169 130' 8.5" SCAFF Y UT DRAIN OW F015B TO SYSTEM ATTACH 6(3)ACCESS F0178 NONE 24.00 22.876 SOO039 130' 138'-9" SCAFF Y VENT DRAIN TOP DRYWELL ACCESS OW F3031 COND SYSTEM ATTACH 6(3)ACCESS MAKEUP 1E11F3031 4.500 4.026 130' 136 SCAFF Y UT DRAIN VENT IN DRYWELL ACCESS -------------21 i 22 Enclosure 42EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Monitor Point # 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 System 1E11 1 E11 1 E11 1 E11 1E21 1E21 1 E21 1 E21 1E21 1E21 1E41 1E41 1E41 1E51 1 E51 1 E51 1E51 1E21 One Line 10037D19 10037D19 10037D19 10037D19 10036D97 10036D97 10036D98 10036D98 10036D98 10036D98 10037DOO 10037DOO 10037DOO 10037D01 10037D01 10037D01 10037D01 10036D97 One Line Location 6 7 8 9 1 2 1 Room NE DIAG NE DIAG NE DIAG NE DIAG SE NE RX RX RX RCIC CSA Attachments 1, 2 and 6 Max Pipe Allowable 00 Pipe 10 Floor Access Monitoring Monitoring Void Size Description Vent Valves [in] [in] Isometric EI LineEI Needs Insulated Method Frequency (Cu. Ft.) Questions/Comments F007B TO C002B N 3.500 3.068 SOO049 87' 93 SCAFF Y FLUSH QUARTER ATTACH 6(3) MAY BE ABLE TO STAND ON PUMP DISCHARGE PIPE SYSTEM CAPONTOPB HX N (R.V. F055B) 14.00 13.250 SOO038 118' 122 NONE Y UTI FLUSH(1) DRAIN/ QUARTER ATTACH 6(3) CAP ON INSIDE TORUS ROOM WALL AT D005B ORIFICE NONE 20.00 19.000 SOO038 96' 104 SCAFF Y FLUSH QUARTER ATTACH 6(3) ABOVE PUMP MOTORS C002B/D DISCHARGE 1 E11 F3028 20.00 19.000 SOO038 107' 116 SCAFF Y UT SYSTEM DRAIN ATTACH 6(3) AT CONFLUENCE OF C002B ANDD CST SUCTION 92'-7 SYSTEM PIPE STUB CAPPED; OPEN F002A NONE 14.00 13.625 SOO073 87' 1/2" SCAFF N UT DRAIN 0.13 F002TOVENT CST SUCTION 92'-7 SYSTEM F002B NONE 14.00 13.625 TBD 87' 1/2" SCAFF N UT DRAIN 0.18 1E21F002B CST SUPPLY F030A TBD 2.375 1.939 S01315 158' 173'-10" TBD N FLUSH CYCLE ATTACH 6(3)

CONDENSATE TRANSFER SUPPLY F030B TBD 2.375 1.939 S01312 158' 174'-3" TBD N FLUSH CYCLE ATTACH 6(3) BEHIND P005 PANEL CS A INJ LINE D003A -F005A TBD 10.75 10.020 SOO075 158' 172'-9" TBD N VENT MONTH ATTACH 6(3) OUTSIDE MG SET PLATFORM CS B INJ LINE D003B TO F005B 1E21F013B 10.75 10.020 TBD 158' 172'-9" TBD N VENT MONTH ATTACH 6(3) RWCU HX PLATFORM SYSTEM UTI DRAINI CST SUCTION F3001 16.00 15.5" H16868 119' 123'-0" NONE N FLUSH QUARTER 0.88 SYSTEM TORUS UTI DRAINI SUCTION NONE 16.00 15" H16868 87' 90'-1" NONE N FLUSH(1) QUARTER 0.10 SYSTEM UTI DRAINI DISCHARGE 1E41F3008 14.00 13.00 H16869 123' 123'-6" NONE Y VENT MONTH 4.061 MONTHI ATTACH DISCHARGE NONE 4" 3.624" H16874 114' 123'-11" SCAFF N FLUSH(1) QUARTER 6(3) INNER CATWALK BAY 1 SYSTEM CONDENSATE 93'-6 UTI DRAINI PUMP RETURN NONE 2" 2.067" S01466 87' 7/16" SCAFF N QUARTER FLUSH 0.03 TORUS 89'-8 SYSTEM SUCTION NONE 6" 6.065" H16873 87' 7/8" NONE N UT DRAIN 0.02 SYSTEM DISCHARGE NONE 4" 3.826" H16874 87' 104'-11" SCAFF N UTI FLUSH DRAIN/ QUARTER ATTACH 6(3) SYSTEM INNER CATWALK @ CST SUCTION 1E21F127 14" 13.25" H16121 117' 121'-2" TBD N UT DRAIN 0.73 COLUMN LINES R6-RJ 38 39

2EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1, 2 and UTOR SYSTEM IN TORUS SOUTHI 40 1E51 H16334 10037001 3i 4) RCIC CST SUCTION NONE 6" 6.065" H16108 87' 108'-7" SCAFF Y FLUSH DRAIN 0.29 SOUTHWEST SYSTEM ATTACH MAY BE REACHED FROM 21(4) 6(3)41 1 E41 H16332 10037000 HPCI DISCHARGE 1E41F3004 14" 12.500" H16869 87' 95'-10" SCAFF N FLUSH DRAIN NEARBY STAIRS SYSTEM ATTACH 43(4) 6(3)42 1E11B H16329 10037019 RHRB DISCHARGE NONE 16" 15.250" H16837 117' 119'-6" NONE Y FLUSH DRAIN NORTHEAST DIAGONAL ---------------------

i ----

piping IS pertormed dUring lUll pump (2)Une is partially vented during each monthly TS surveillance.

(3)See maximum allowable void volume table in Attachment

6. (4)This location is detailed in Attachment 4 of Westinghouse Report LTR-SEE-III-08-140, rev. 1

Enclosure 42EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1, 2 and 6 -----------------------,--------,---------Max Pipe Allowable Monitor Westinghouse One Line OD Pipe ID Floor Line Access Monitoring Void Size Point # System P&ID One Line Dwg Location Room Description Vent Valves [il1] [In] Isometric EI EI Needs Insulated Method Frequency (Cu. Ft.) Questions/Comments DISCHARGE SYSTEM ATTACH 6(3)1 2E11A H26015 10037D04 1 NE DIAG C002A FV022 20.00 19.000 S31755 107' 114'-8" SCAFF. Y UT DRAIN CONFLUENCE OF C002NC -------'----------RHR A STEAM COND LINE SYSTEM (CAPPED) AT UTI DRAINI ATTACH CAP ON TORUS ROOM 2 2E11A H26015 10037D04 2 NE DIAG B001A HX NONE 16.00 15.250 S28396 118' 123'-8" NONE Y FLUSH(1) QUARTER 6(3) WALL NORTH END DW ACCESS, DW SYSTEM ATTACH LLRT CONNECTION BELOW 6(3)2E11A H26015 10037D04 3 ACCESS F017A TBD 24.00 22.876 S31899 130' 134'-6" NONE Y UT DRAIN F017 3 SOUTH END DW ACCESS, DW SYSTEM ATTACH LLRT CONNECTION BELOW 6(3)4 2E11B H26014 10037D04 4 ACCESS F017B 2E11F058B 24.00 22.876 S28472 130' 134'-6" NONE Y UT ----DRAIN RHR B COND LINE (CAPPED) AT UTI DRAINI 6(3)2E11B H26014 10037D04 5 SE DIAG B001B HX NONE 16.00 15.250 TBD 118' 123' NONE Y FLUSH(1) QUARTER CAPPED IN DIAGONAL 5 1------C002B/D ATTACH UPSIDE DOWN U 6(3)6 2E11B H26014 10037D04 6 SE DIAG CONFLUENCE FV021 20.00 19.000 S31754 107' 114' SCAFF. Y FLUSH QUARTER NOT PIPING UNDER SYSTEM 6(3)7A 2E11A H26014 10037D04 SHOWN TBD F016A TBD 16.00 15.250 TBD 130' TBD TBD _IB[)_ UT DRAIN -------------VERTICAL PIPING UNDER SYSTEM ATTACH RWCU HX ROOM INSIDE 6(3)7B 2E11B H26014 10037D04 7 RWCU HX F016B F036B 16.00 15.250 S31425 158' 169' SCAFF. N UT DRAIN F023 HEAD ATTACH EAST SIDE BY HI 6(3)8 2E11B H26014 10037D04 8 RX BLDG SPRAY HARD PIPE 4.500 4.026 S31419 185' 193' SCAFF. Y VENT MONTH VENTS F067 RECIRC SYSTEM JUST OFF 147' GRATING IN 9 2E11 H26015 10037D04 1 DW SUCTION SDC TBD 20.00 19.000 S28478 147' 154'-6" SCAFF. Y UT DRAIN TBD DW SYSTEM --EVEN WITH GRATING ON 10 2E11B H26014 10037D04 2 SE DIAG BELOW F006D NONE 20.00 19.000 S28406 107' 107' SCAFF. Y UT DRAIN TBD 107' SYSTEM ON 97' GRATING (MAY NEED 11 2E11B H26014 10037D04 3 SE DIAG

_____ -NONE 20.00 19.000 S28412 107' 110' NONE ---Y UT DRAIN TBD TQ COME FROM BELOW) SYSTEM 12 2E11A H26015 10037D04 4 NE DIAG BELOW F006A NONE 20.00 19.000 S28398 107' 112' NONE Y UT DRAIN TBD SYSTEM BACK CORNER NEED 13 2E11A H26015 10037D04 5 NE DIAG BELOW F006C NONE 20.00 19.000 $£839L 107' 107' SCAFF. Y UT DRAIN TBD SCAFF FROM 97' SYSTEM 2E11 H26015 10037D04 6 DW F008 TO F009 NONE 20.00 19.000 S28478 127' 135' SCAFF. Y UT DRAIN TBD 14 -----------------15 2E21A H26018 10037D07 1 NE DIAG E21F002A NONE 14.00 13.250 S27015 97' 100' NONE N UT DRAIN 16 2E21B H26018 10037D07 2 SE DIAG F002B NONE 14.00 13.250 S26991 97' 100 NONE N UT DRAIN CS2A INJECTION UTI DRAINI VENT(2) 17 2E21A H26018 10037D07 3 RX BLDG LINE NONE 10.7 10.020 TBD 158' 171 '-3" NONE N MONTH D003A I

Enclosure 42EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1, 2 and 6 Max Pipe Monitor Westinghouse One Line OD PlpelD Floor Line Access Monitoring Void Point # System P&ID One Line Location Room Description Vent Valves [in] [in] Isometric EI EI Needs Insulated Method (Cu. Ft.)

CS2B INJECTION UTI DRAINI 18 2E21B H26018 10037D07 4 RWCU HX LINE NONE 10.75 10.020 TBD 158' 171'-3" SCAFF. N VENT(2) MONTH 6(3) DISCHARGE SYSTEM 6(3)19 2E21A H26018 10037D07 5 NE DIAG LINE NONE 12.75 12.090 TBD 118' 123'-2" NONE N UT DRAIN DISCHARGE SYSTEM 20 2E21B H26018 10037D07 6 SE DIAG LINE NONE 12.75 12.090 TBD 118' 123'-2" NONE N UT F015B COMMON I 21 2E41 H26020 10037D05 1 HPCI SUCTION NONE 14 13.25 H26839 87' 92'-6" NONE N FLUSH(1) QUARTER VENTI MONTHI 6(3)22 2E41 H26020 10037D05 2 TORUS DISCHARGE NONE 14 12.5 H26840 114' 109'-6" NONE Y FLUSH QUARTER OUTER CATWALK BAY 2 SYSTEM S.E.DIAGONAL AGAINST 23 2E51 H26023 10037D06 1 TORUS RHR SUCTION FV101 4 4.026 H26844 87' 107'-9" YES Y UT DRAIN TBD TORUS WALL DISCHARGE I ATTACH 6(3)24 2E51 H26023 10037D06 2 TORUS FEED NONE 4 3.826 H26845 114' 123'-0" YES Y FLUSH(1) QUARTER INNER TORUS BAY 25 2E51 H26024 10037D06 3 RCIC DIAG PUMP RETURN NONE 2 1.939 S31014 87' 90'-4" NONE Y FLUSH QUARTER TORUS 26 2E51 H26023 10037D06 4 RCICDIAG SUCTION NONE 6 6.065 H26844 87' 89'-5" NONE Y UT DRAIN SYSTEM ATTACH UPSTREAM OF 6(3)27 2E11A H26015 10037D04 NE DIAG DISCHARGE NONE 24 22.876" H26820 117' 121'-5" NONE FLUSH DRAIN ORIFICE 2E11 N014A SDC SUCTION UTOR SYSTEM 50(4)28 2E11A H26015 10037D04 NE DIAG TO C002C NONE 20 19.000" H26819 115' 115'-1" LADDER FLUSH DRAIN 0.58 UTOR SYSTEM 24A1B(4)29 2E51 H26023 10037D06 TORUS CST SUCTION NONE 6 6.065" H26844 87' 108'-7" SCAFF FLUSH DRAIN UTOR SYSTEM 6(3)30 2E51 H26023 10037D06 RCIC DIAG DISCHARGE NONE 4 5.761" H26845 87' 104'-1" SCAFF FLUSH DRAIN piping IS pertormed dunng tUIl pump (2)Une is partially vented during each monthly TS surveillance.

(3)See maximum allowable void volume table in Attachment

6. (4)This location is detailed in Attachment 4 of Westinghouse Report L TR-SEE-III-08-141, rev. 1 2EN-MON-001-0 "Monitoring and Trending of Gas Accumulation in Safety Injection Attachments 1, 2 and TOTAL ALLOWABLE VOLUME(2)

SYSTEM INCLUDED MONITORING LOCATIONS(1)

RELIEF VALVE LIFTING [in 3] RELIEF VALVE LIFTING [tel SUPPORT DAMAGE [in 3] SUPPORT DAMAGE [tt 3 ] lEllA 8,9,10,11,13,14 10746.3 6.219 7403.3 4.284 lEl1B 17,18,19,20,21,22,23,24,25 9976.8 5.774 9976.8 5.774 lE11B @ FPC 17,18,19,21,22,23,24,25 3276.8 1.896 5876.8 3.401 1E21A 28,30 934.2 0.541 994.2 0.575 lE21B 29,31 1014.2 0.587 1034.2 0.598 1E41 N/A N/A 2218.7 1.284 lE51 34,37 N/A N/A 2342.6 1.356 2El1A 1,2,3,7A 14062.8 8.138 15462.8 8.948 2E11B 4,5,6,7B 9362.8 5.418 9262.8 5.360 2E11B @ F023 4,5,6,7B,8 5576.8 3.227 6093.8 3.527 2E21A 17,19 270.0 0.156 910.0 0.527 2E21B 18,20 300.0 0.174 1000.0 0.579 2E41 22 N/A N/A 3518.7 2.036 2E51 24 N/A N/A 4895.6 2.833 Due to the nature of pump start (pressure wave) and void collapse water hammer phenomena, the sum of all the voids the discharge piping must be used. (2)The left hand columns provide the void size required to potentially lift the system discharge relief valve due to water hammer related pressure spikes. The right hand columns provide the void size required to potentially damage piping supports due to excessive water hammer related loading. The lower of the given values should be used as the system maximum total allowable void volume. In general, this is the volume associated with relief valve lifting.