Text

Supplemental Information Related to Request for Additional Information Regarding Reactor Coolant System Leakage Detection Systems License Amendment Request (Lbdcrs 07-MP2-012 and 07-MP3-032)
	ML082470693
Person / Time
Site:	Millstone
Issue date:	09/03/2008
From:	Hartz L; Dominion, Dominion Nuclear Connecticut
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	08-0251B, TAC MD6640, TAC MD6641
	Download: ML082470693 (13)
	v • d • e

I.~

Dominion Nuclear Connecticut, Inc.

'lOOO Dominion Boulevard, Glen Allen, Virginia r;o60

\V"b I\ddrcss: www.dom.com

"'~'Domlnlon

, ..

September 3, 2008 U. S. Nuclear Regulatory Commission Serial No. 08-0251 B Attention: Document Control Desk NLOS/GAW RO One White Flint North Docket Nos. 50-336 11555 Rockville Pike 50-423 Rockville, MD 20852-2738 License Nos. DPR-65 NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNITS 2 AND 3 SUPPLEMENTAL INFORMATION RELATED TO REQUEST FOR ADDITIONAL INFORMATION REGARDING REACTOR COOLANT SYSTEM LEAKAGE DETECTION SYSTEMS LICENSE AMENDMENT REQUEST (LBDCRS 07-MP2-012 AND 07-MP3-032) (TAC NOS. MD6640 AND MD6641)

On August 15, 2007, Dominion Nuclear Connecticut, Inc. (DNC) submitted a request to the Nuclear Regulatory Commission (NRC) for an amendment to Technical Specification (TS) 3.3.3.1, "Radiation Monitoring," and TS 3.4.6.1, "Reactor Coolant System Leakage Detection Systems" for Millstone Power Station Units 2 and 3 (MPS2 and MPS3) (Serial No. 07-0449) that would require only one containment radioactivity monitor (particulate channel) and the containment sump level monitoring system to be operable in Modes 1, 2, 3, and 4. Following review of the license amendment request, the NRC issued a request for additional information (RAI). DNC responded to this request in letters dated May 27, 2008 (Serial No. 08-0251) and July 24,2008 (Serial No. 08-0251A).

On August 21, 2008, a conference call was held between the NRC and DNC to further discuss DNC's response to RAI Question 4. As a result, it was determined that references to existing surveillance requirements (SR) (SR 4.4.6.2.1 for MPS2 and SR 4.4.6.2.1.d for MPS3) as proposed for TS 3.4.6.1 Actions a, b, and c, are not necessary. The attachments to this letter contain additional supplemental information related to RAI Question 4 and the revised marked-up TS pages deleting reference to the existing surveillance requirements.

The information provided in this letter does not affect the conclusion of the significant hazards consideration discussion provided in the August 15, 2007, DNC letter (Serial No. 07-0449).

Serial No. 08-0251 B Docket Nos. 50-336 50-423 RCS Leakage Detection RAI Question 4 Supplemental Information Page 2 of 3 Should you have any further questions in regard to this submittal, please contact Mr. Geoffrey A. Wertz (804) 273-3572.

Sincerely, C .

/~V7j/11*

I/(/(C; Leslie N. Ha Vice President - Nuclear Support Services COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Leslie N. Hartz, who is Vice President - Nuclear Support Services of Dominion Nuclear Connecticut, Inc. She has affirmed before me that she is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of her knowledge and belief.

Acknowledged before me this 3 ~~ay of .¥' 2008.

My Commission Expires: '&1 34 dt2/Q

/h-:h ..;(':J/We' .

Notary Public Attachments:

1. RCS Leakage Detection Systems RAI Question 4 Supplemental Information

2. Revised Marked-Up Technical Specification Pages, MPS2

3. Revised Marked-Up Technical Specification Pages, MPS3 Commitments: None

Serial No. 08-0251 B Docket Nos. 50-336 50-423 RCS Leakage Detection RAI Question 4 Supplemental Information Page 3 of 3 cc: U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 C. J. Sanders Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08-B3 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station Director Bureau of Air Management Monitoring and Radiation Division CT Department of Environmental Protection 79 Elm St.

Hartford, CT 06106-5127

Serial No. 08-0251 B Docket Nos. 50-336 50-423 ATTACHMENT 1 LICENSE AMENDMENT REQUESTS (LBDCRS 07-MP2-012 and 07-MP3-032)

RCS LEAKAGE DETECTION SYSTEMS RAI QUESTION 4 SUPPLEMENTAL INFORMATION DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNITS 2 AND 3

Serial No. 08-0251 B Docket Nos. 50-336 50-423 RCS Leakage Detection RAI Question 4 Supplemental Information Attachment 1 Page 1 of 3 Res Leakage Detection RAI Question 4 Supplemental Information As discussed in the conference call on this topic between the Nuclear Regulatory Commission (NRC) and Dominion Nuclear Connecticut, Inc. (DNC) on August 21, 2008, DNC is providing additional supplemental information to Question 4 related to the NRC's request for additional information (RAI) dated May 13, 2008.

Question 4 Explain how the proposed action statements affect the redundancy and minimal functionality of leak detection instrumentation necessary to support the leak-before-break analysis.

Discussion In letters dated August 15, 2007 and July 24,2008 (Serial Nos. 07-0449 and 08-0251A, respectively), DNC proposed changes to TS 3.4.6.1 Actions a and b, and also proposed a new TS 3.4.6.1 Action c, for both MPS2 and MPS3. Specifically, DNC proposed that when any or both of the TS-required reactor coolant system (RCS) leakage detection monitoring systems are inoperable, an RCS water inventory balance would be performed (at specified frequencies) in accordance with existing surveillance requirements (SR) (i.e., SR 4.4.6.2.1 for MPS2 and SR 4.4.6.2.1.d for MPS3).

In a teleconference call on August 21, 2008, the NRC staff raised questions regarding DNC's response to RAI Question 4 provided in letter dated July 24,2008 (Serial No. 08-0251A).

Based on these discussions, it was determined that reference to these existing SRs is not necessary. Hence, DNC is proposing to remove the references to SR 4.4.6.2.1 (for MPS2) and SR 4.4.6.2.1.d (for MPS3) within the proposed TS 3.4.6.1 Actions a, b, and c.

ONe Response DNC is proposing the following changes to Technical Specification (TS) 3.4.6.1 Actions a, b, and c.

Proposed TS 3.4.6.1 Actions at b. and c

a. With both of the containment atmosphere particulate radioactivity monitoring channels inoperable, operation may continue for up to 30 days provided:

Serial No. 08-0251 B Docket Nos. 50-336 50-423 RCS Leakage Detection RAI Question 4 Supplemental Information Attachment 1 Page 2 of 3

1. Appropriate grab samples of the containment atmosphere are obtained and analyzed for particulate radioactivity at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or

2. A Reactor Coolant System water inventory balance is performed at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months during steady state operation.

Otherwise, be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

b. With the containment sump level monitoring system inoperable, operation may continue for up to 30 days provided:

1. A Reactor Coolant System water inventory balance is performed at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months during steady state operation.

Otherwise, be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

c. With both the containment atmosphere particulate radioactivity monitoring channels inoperable and the containment sump level monitoring system inoperable, operation may continue for up to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months provided:

1. Immediate action is initiated to restore either a containment atmosphere particulate radioactivity monitoring channel or the containment sump level monitoring system to OPERABLE status, and

2. Appropriate grab samples of the containment atmosphere are obtained and analyzed for particulate radioactivity within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and at least once per 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months thereafter, and

3. A Reactor Coolant System water inventory balance is performed within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and at least once per 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months thereafter.

Otherwise, be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

Proposed TS 3.4.6.1 Actions a, b, and c

a. With the Containment Atmosphere Particulate Radioactivity Monitor inoperable, operations may continue for up to 30 days provided:

1. Appropriate grab samples of the containment atmosphere are obtained and analyzed for particulate radioactivity at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or

Serial No. 08-0251 B Docket Nos. 50-336 50-423 RCS Leakage Detection RAI Question 4 Supplemental Information Attachment 1 Page 3 of 3

2. A Reactor Coolant System water inventory balance is performed at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months during steady state operation.

Otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With the Containment Drain Sump Monitoring System inoperable, operation may continue for up to 30 days provided:

1. A Reactor Coolant System water inventory balance is performed at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months during steady state operation.

Otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With the Containment Atmosphere Particulate Radioactivity Monitor inoperable and the Containment Drain Sump Monitoring System inoperable, operation may continue for up to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months provided:

1. Immediate action is initiated to restore either the Containment Atmosphere Particulate Radioactivity Monitor or the Containment Drain Sump Monitoring System to OPERABLE status, and

2. Appropriate grab samples of the containment atmosphere are obtained and analyzed for particulate radioactivity within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and at least once per 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months thereafter, and

3. A Reactor Coolant System water inventory balance is performed within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and at least once per 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months thereafter.

Otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Serial No. 08-0251 B Docket No. 50-336 ATTACHMENT 2 LICENSE AMENDMENT REQUEST (LBDCR 07-MP2-012)

RCS LEAKAGE DETECTION SYSTEMS REVISED MARKED-UP TECHNICAL SPECIFICATION PAGES DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNIT 2

c?Ggust 1.. 1915"')-

REAcroR COOLAli1:SYSTBM 314.4.6 REACTOR COOLANT SYSTBMLMKAGB LEAl<AGEPEmCTION SYSTEMS L1Ml11NGCONDITION FOR OPERATION

3.4.6.1 The fullowing Reactor Coolant S~tem leakage detection systems 5hall be OPERABLE:

'.

a.

(OncOftwp) Ccb1;:2

)('&)nfainntent atmosphere particulate radioactivity monitorin ~ ~

.

@!.)

b. The containment sump level monitoring SY8f~

c. 'cous radioaetlvl monitonug system.

APPLICABILITY' MODES I. 2. 3 and 4.

ACfION;

a. With one ofthe above radioactivily moriitoring Jeabge detection systems inoperable, operations may continue for up to 30 days provided:

1. The otIter two above required leakage detection systems are OPERABLE, .......

and

2. Appropriate grab samples ate obtained and anal)"ZOO. at least on~~ per 24 boW'S; otherwise. be iq COLD SHUTDOWN within the next 36 bou~.

b. With (fte containmellt sump level monitoring system il\opcrable. restore the inoperabtesystem to OpERABLB status wiOun 1 days or be in COLD S *

tile next 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

SUllVEILLANCBREQUIRBMBNTS

!; i 4.4.6.1 Tho leakage detection systems sltall be demonstrated OPBRABLB by:

a. Contaimnentatll1oSPheret:asiiian~culate monitoringsystemtPenormance 9fCHANNBL CHECK, CHANNEL CALIBRAnON and CHANNEL FUNcrroNAL TEST at the frequencies specified in Table 4.3-3, and

b. Containment sump J~vel monitoring systenl-pedonnance ofCHANNBL

. CAUBRATION TEST at least once per 18 months.

MILLSTONE - UNIT 2 3/44.8 ,."

(

'"

Serial No. 08-0251 B Docket No. 50-336 Millstone Power Station Unit 2 Technical Specification 3.4.6.1 Leakage Detection Systems Page 3/44-8 Insert A