ML062850261

Email: (PA) Filter Question

ML062850261
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	06/22/2006
From:	Hamer M Entergy Nuclear Vermont Yankee
To:	Rowley J NRC/NRR/ADRO/DLR/REBB
References
%dam200611, TAC MD2297
Download: ML062850261 (7)

Text

LRc ard rEmch - RE: filter question..

Page_1 _

From:

"Hamer, Mike" <mhamer@entergy.com>

To:

"Jonathan Rowley" <JGR@nrc.gov>

Date:

Thu, Jun 22, 2006 7:55 AM

Subject:

RE: filter question

Jonathan, Please see the attached four pages from the HVAC DBD. The Control Room was designed to conform with Draft AEC Criterion 11 which is equivalent to the Final GDC Criterion 19.

Control Room Habitability was reanalyzed during implementation of AST.

Current analysis and licensing basis indicates that there is no need for charcoal filtration. 30 day dose is -3.5 Rem with essentially unlimited in-leakage.

G-1 91237 Sheet 2 shows CR-HVAV.

From: Jonathan Rowley [1]

Sent: Wednesday, June 21, 2006 4:44 PM To: Hamer, Mike

Subject:

filter question Mike Could you attain an answer to the following question:

Does Vermont Yankee's control room design include charcoal and HEPA filters to meet GDC 19 requirements for radiation does?

Jonathan Rowley, Project Manager License Renewal Branch B Division of License Renewal Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission (301) 415-4053 CC:

"Lach, David J" <DLach @ entergy.com>

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RE: filter question Thu, Jun 22, 2006 7:54 AM "Hamer, Mike" <mhamer@entergy.com>

mhamer@entergy.com Recipients nrc.gov TWGWPO03.HQGWDO01 JGR (Jonathan Rowley) entergy.com DLach CC (David J Lach)

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Vermont Yankee Document HVAC HVAC Systems Revision 4 Design Basis Document Page 15 of 98 2.0 SYSTEM DESIGN BASES REQUIREMENTS 2.1.

SYSTEM FUNCTIONS 2.1.1. Safety Related Functions 2.11.1.

Control Room - The Control Room HVAC system shall provlflb the appropriate temperature conditions for personnel and equipment in the Control Room during any mode of operation or the most adverse emergency condition. (Reference 5.6.1 Appendix I) 2.1.1.2.

Control Room - The Control Room HVAC system shall limit exposure of personnel to airborne contaminants by isolating the Control Room to prevent migration of air to radioactively clean areas from areas of progressively higher contamination. The function is provided by the Control Room HVAC system to meet Draft AEC Criterion 11 and IOCFR20. (Reference 5.6.1 Appendices I and F) 2.1.1.3.

Deleted 2.1.1.4.

Diesel Generator Rooms - The Diesel Generator ventilation system shall provide adequate flow of cool air from the outside to ensure that the reliable operation of the Diesel Generator and its auxiliary equipment will be maintained. (References 5.6.1, Section 10.12.3.2) 2.1.1.5.

ECCS Corner Rooms - The Reactor Recirculation Units RRU-7 and RRU-8 shall provide adequate cooling to the ECCS Rooms during all modes of operation to ensure reliable operation of the Core Spray Pumps, Residual Heat Removal Pumps, and the RHR Service Water Pumps.

(References 5.2.17 and 5.3.18) 2.1.1.6.

ECCS Corner Rooms - The Reactor Recirculation Units RRU-5 and RRU-6 shall maintain the SW System pressure boundary integrity so as not to adversely impact SW System heat removal and flooding design bases. (References 5.2.17 and 5.3.18) 2.1.1.7.

Reactor Building - Reactor Building ventilation isolation shall be provided to ensure that the Standby Gas Treatment System limits the exfiltration from the secondary containment and maintains the Reactor Building at a sub-atmospheric pressure. (References 5.6.1 Section 5.3.4, and 5.8.4) The function is provided by Reactor Building ventilation isolation to meet Draft AEC Criterion 10 and the original guidelines of 10CFR100 (Reference 5.6.1 Appendix F) and the present limits of 10CFR50.67. (Reference 5.6.27)

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Vermont Yankee Document HVAC HVAC Systems Revision 4 Design Basis Document Page 16 of 98 2.1.1.8.

Reactor Building - The cooling coils for Reactor Recirculation Units RRUs 1, 2, 3, and 4 shall provide a pressure boundary between primary containment and RBCCW. The RRU-1, 2,3 and 4 component pressure boundary ensures that a radioactive material boundary is established for any fluid escaping the Reactor Coolant System pressure boundary.

(Reference 5.9.3) 2.1.1.9.

Reactor Building - The ventilation to the RCIC Room shall be designed to prevent the environment resulting from a'HELB from reaching the Equipment Room on the elevation above. (Reference 5.9.4) 2.1.1.10.

Battery Room - The Main Station Battery Room Ventilation System shall prevent an explosive concentration of hydrogen from building up in the room. (Reference 5.6.1, Question 8.6) 2.1.1.11.

Battery Room - The Main Station Battery Room Ventilation System shall provide the appropriate temperature >60°F for operation of the safety-related batteries. (Reference 5.1.19.

2.1.2. Non-Safety Related Functions 2.1.2.1.

Control Room - The Control Room HVAC system shall provide the appropriate humidity conditions for personnel and equipment in the Control Room. (Reference 5.6.1, Section 10.12.2) 2.1.2.2.

Control Room - The Control Room HVAC system shall filter outside air to limit the introduction of particulate matter into the plant. (Reference 5.6.1, Section 10.12.2) 2.1.2.3.

Control Room - The Control Room HVAC system shall provide heating*

to the Control Room during cold weather conditions. (Reference 5.6.1, Section 10.12.2) 2.1.2.4.

Diesel Generator Rooms - The EDG Room heaters shall maintain a minimum temperature of 50°F to ensure the operability of the as-2 batteries. (Reference 5.1.18) Normal room infiltration shall maintain hydrogen concentration well below 2% by volume (hydrogen is potentially generated from the AS-2 batteries.) (Reference 5.1.20) 2.1.2.5.

ECCS Rooms - The Reactor Recirculation Units RRU-5 and RRU-6 shall provide supplemental cooling to the ECCS Rooms containing the RHR Service Water Pumps during all modes of operation to enhance the reliability of the RHRSW Pump motors and electrical equipment (Reference 5.3.18).

Richaýd Em* ch - CR HVAC DBD.pdf Page 3 11 Richard Emch - CR HVAC DBD.pdf Paae 311 Vermont Yankee HVAC Systems Design Basis Document Document HVAC Revision 4 Page 19 of 98 Appendix F of the UFSAR (Reference 5.6.18) contains the original evaluation of the design bases of the facility relative to each of the nine groups of the 70 proposed General Design Criteria. In each group, a statement of VYNPS' understanding of the intent of the criteria of that group is made and a discussion of the plant design conformance is presented. UFSAR Appendix F is designated as historical.

The following is a listing of proposed General Design Criteria that were identified as being applicable to the HVAC Systems in the original FSAR Appendix F conformance evaluation. A cross reference between these proposed General Design Criteria and corresponding final GDC's is provided to facilitate understanding of which GDC could be applied as design criteria guidance.

Draft AEC Criterion Equivalent Final GDC Criterion

1. Quality Standards

1. Quality Standards & Records

2. Performance Standards

2. Design Basis for Protection Against Natural Phenomena

3. Fire Protection

3. Fire Protection

5. Records Requirements I. Quality Standards & Records

10. Containment

16. Containment Design

11. Control Room

19. Control Room

12. Instrumentation & Control Systems

13. Instrumentation & Control The proposed General Design Criteria 2, 3, 10, 11 and 12 were applied by the AEC to the review of the VY Operating License application. Since these criteria apply specifically to the HVAC Systems, they will be discussed below. The other criteria listed above have generic applicability to the HVAC Systems and will not be specifically addressed in this document.

K

Richard Emch - CR HVAC DBD.pdf Page4 Vermont Yankee Document HVAC HVAC Systems Revision 4 Design Basis Document Page 21 of 98 Vital fire barriers separate vital fire areas. Where ducts penetrate vital fire barriers, a fire damper is installed in the penetration. The dampers shut when fusible links, or electro-thermal links (ETL), open at 1650F. The ETLs can be released remotely with an electrical signal. Fire dampers that cause alarms when they shut annunciate on the Control Room pyrotronics panel. The Control Room can be isolated by operation of the damper ETL switches if required to prevent intrusion of an adverse environment.

(Reference 5.9.15) 2.2.1.3.

Draft AEC Criteria 10 - Containment Reactor Building ventilation isolation is provided to ensure that the Reactor Building, in the event of a design basis accident, contains airborne fission products such that the release of fission products is within the original dose limits specified in IOCFR100 (Reference 5.6.1 Section 5.3.4 and Appendix F) and the present limits of 10CFR50.67. (Reference 5.6.27)

Conformance with Draft AEC Criterion 10 is outlined in Appendix F of the FSAR. (Reference 5.6.1 Appendix F) Reactor Building ventilation isolation is provided to allow the Standby Gas Treatment System to maintain a negative pressure in the Reactor Building. (References 5.3.23, 5.4.10, 5.6.5 and 5.8.8) 2.2.1.4.

Draft AEC Criterion 11 - Control Room A centralized Control Room is designed having adequate shielding to permit access and occupancy within the prescribed dose limits during any of the design basis accidents analyzed to conform to Draft AEC Criteria

11. (Reference 5.6.5)

Conformance with Draft AEC Criterion 11 is outlined in Appendix F of the FSAR. (Reference 5.6.1 Appendix F) The HVAC Systems are provided to ensure occupancy is maintained within prescribed dose limits and to allow safe control of the station to be maintained from the Control Room. (Reference 5.6.10) 2.2.1.5.

Draft AEC Criterion 12 - Instrumentation and Control Systems Instrumentation and controls is provided to monitor and maintain variables within the prescribed operating ranges of the HVAC Systems to conform to Draft AEC Criterion 12. (Reference 5.6.5)