ML20207P910

Rev 1 to Fire Protection Design:Lack of Fire Dampers in Addl Diesel Generator Bldg, Element Rept

ML20207P910
Person / Time
Site:	Sequoyah
Issue date:	01/09/1987
From:	Mcnutt G, Russell J TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20207P893	List: ML20207P892 ML20207P895 ML20207P900 ML20207P903 ML20207P907 ML20207P910 ML20207P913 ML20207P916 ML20207P922 ML20207P926
References
231.4-(B), 231.4-(B)-R01, 231.4-(B)-R1, NUDOCS 8701200397
Download: ML20207P910 (9)

Text

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.. TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4(B)

SPECIAL PROGRAM REPORT TYPE: SEQUOYAH ELEMENT REVISION NUMBER: 1 TITLE: FIRE PROTECTION DESIGN Lack of Fire Dampers in Additional Diesel Generator Building PAGE 1 0F 8 r REASON FOR REVISION:

1. Incorporation of Senior Review Panel (SRP) and Technical Assistance Staff (TAS) comments of 11/05/86, and compliance with report format-revision 3 of 12/10/86, adding Section 9. Chronology, and Section 10. Corrective Action.

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. , - TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4(B)

SPECIAL PROGRAM REVISION NUMBER: 1 L [ PAGE 2 0F 8 l 1. CHARACTERIZATION OF ISSUE (S):

l- Concerns:' Issue:

l IN-86-305-002 Lack of fira dampers in the #5 diesel

! "There are no fire dampers in generator building could cause diesel-generator building #5 spreading of fire.

l 1eading to the fan room. If a i fire were to break out i downstairs, the fans would pull l the flames through the floor 1 grating of the fan room." l

2. HAVE' ISSUE (S) BEEN IDENTIFIED IN ANOTHER SYSTEMATIC ANALYSIS? YES X NO Identified by TVA NSRS ,

Date 12/10/85 I

Documentation Identifiers:

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l NSRS Investigation Report No. I-85-693-WBN, Fire Dampers in Diesel Generator Building l 3. DOCUMENT NOS., TAG NOS., LOCATIONS, OR OTHER SPECIFIC DESCRIPTIVE l IDENTIFICATIONS STATED IN ELEMENT.

, Reference is made to #5 diesel generator (DG) building, which is a separate structure housing only one DG system serving either Sequoyah Unit 1 or 2.

4. INTERVIEW FILES REVIEWED:

ECTG cxpurgated file contained no additional information other than -

the K-form for this concern. ECTG working file contained the NSRS l

report I-85-693-WBN. ,

5. DOCUMENTS REVIEWED RELATED TO THE ELEMENT:

i See Appendix A.

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, TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4 (B)

SPECIAL PROGRAM REVISION NUMBER: 1 I PAGE 3 0F 8

6. WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS, OR OTHER APPLY OR CONTROL IN THIS AREA?

See Appendix A.

7. LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEMENT:

See Appendix A.

8. EVALUATION PROCESS:

a. Compared the fire protection design of the building for the

1. 5 DG with that of the building for the original DGs

1. 1 through 4.

b. Checked compliance of the fire protection barriers with the applicable TVA General Design criteria and other applicable codes and standards.

9. DISCUSSION, FINDINGS, AND CONCLUSIONS:

Chronoloay:

03/83: TVA drawing 47W866-14, Rev. 2, H&V, Additional DG building issued, showing fire dampers.

08/84: TVA GDC SQN-DC-V-ll.l.2, Rev.1 issued (paragraph 4.6 requires fire zones) 05/85: TVA FCR 3532 for deletion of fire dampers approved.

08/85: TVA drawing 17W910-3, Rev. 8, H&V, Additional DG building revised to delete fire dampers per FCR 3532.

On/M: Concern received by TVA.

12/85: haRS Investigation Report No. 1-85-693-WBN issued.

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.. TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4(B)

SPECIAL PROGRAM REVISION NUMBER: 1

[ PAGE 4 0F 8 '

Discussion:

a. The #5 DG is also referred to as " additional" DG in TVA documents. ,

b. The building housing the DGs #1 through 4 consists of.four l adjacent arrangements of rooms separated by fire wall,s. Eac h ,

arrangement contains a DG room and associated rooms for the air intake, air exhaust, and electrical boards that make up ss one DG system. The building is compartmentalized for fire Q -(

protection, and fire dampers are installed in ducts s(

penetrating walls and in floor gratings from the DG rooms to  %

the air intake and exhaust rooms. A The rooms containing the DG sets and electrical boards #1 through 4 are equipped with CO2 fire fighting systems and _' '

require fire dampers released by CO2 pressure for maintaining the gas concentration, or by fusible link, t

c. The #5 DG building does not contain a C02 fire protection i system, and, for this reason, fire dampers are not required. l An aqueous film-forming foam (AFFF) fire suppression system is provided instead. ,

The equipment in the air intake and air exhaust rooms hbove the #5 DG room is an integral part of the DG system:ana must be operational with the DG. Compartmentalization of C individual rooms in the #5 DG building is, therefore, n6t s required. A fire in the #5 DG building would not affedt the DG systems #1 through 4. I

d. TVA General Design Criteria (GDC) ( App. A, 5.c) paragraph 4.6 l requires a fire protection system that prevents fire spreading from peripheral rooms to the #5 DG room. The HVAC design meets this criterion for rooms on the level of the DG set room, where fire dampers are installed at wall penetrations of ducts. However, there are no fire dampers at tie floor gratings of the air intake and exhaust rooms.

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e. The Heating and Ventilating (H&V) flow diagram ( App. A, 5.h) shows fire dampers at the floor grating of the air intake and exhaust rooms to the #5 DG room. H&V mechanical drawing (App. A, 5.1) reflects deletion of the fire dampers per FCR 353? (App A, 5.j). There is a 22-month time period between the revisions of the two conflicting drawings. Per teleplone confirmation of September 15, 1986, hoth drawings are the latest revisions.

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% ' #A TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4 (B)

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-Findings:

The #5 DG system improves r>lant availability during testing, repair, and maintenance of the original four DG systems.

The DG sets #1 through 4 are each in a separate fire zone and . l equipped with C02 fire fighting systems and fire dampers in the floor gratings. This arrangement prevents a fire in any DG or peripheral . room from spreading to other DG systems in the same

. building, and thus complies with Appendix A, to Branch Technical-Position, Auxiliary Power Conversion System _ Branch (APCSB) (App. A, 5.f).

The #5 DG room does not require fire dampers. The design documents are inconsistent regarding the fire dampers in the #5 DG building.

GDC SQN-DC-V-ll.1.2 (App. A, 5.c)'is not complied with. l

Conclusion:

The concern is not valid because the #5 DG building is not required

(; .to be divided into fire zones. However, there are inconsistencies 5- among drawings, design criteria and as-built condition.

10. CORRECTIVE ACTION:

A TVA memo (App. A, 5.k) transmits a corrective action plan which will eliminate the discrepancies between the various design documents related to this concern by deleting the fire protection requirement for the #5 DG building environmental control system.

Paragraph 4.6 in SQN-DC-V-11.1.2, R1, will be deleted to reflect the common fire zone concept for the entire DG#5 building. Note that SQN-DC-V-11.1.1, R0, paragraph 3.13 still specifies a fire protection system for the #5 DG building in its entirety for economical reasons. The planned corrective action is an acceptable solution to the concern.

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TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4(B) 4 SPECIAL PROGRAM REVISION NUMBER: 1 I- PAGE 6 0F 8

-APPENDIX A

5. DOCUMENTS REVIEWED RELATED TO THE ELEMENT:

a. SNP FSAR Section 9.4.5

b. TVA General Design Criteria No. SQN-DC-V-11.1.1, R0,

" Additional Diesel Generator System"

c. TVA General Design Criteria No. SQN-DC-V-11.1.2, R1,

" Additional Diesel Generator Building Environmental Control System"

d. WBNP FSAR Sections 7.4.1.2.3, 8.1.2 and 9.4.5.2.2 (Ref. 5.b above, paragraph 3.la. specifies a similar DG unit as at Watts Bar Nuclear Plant) j e- National Fire Code (NFC) 90A-85, " Installation of Air Conditioning and Ventilating Systems", Section 3-3.7 1 f. Appendix A to Branch Technical Position, Auxiliary Power

Conversion System Branch (APCSB) 9.5-1, " Guidelines for Fire Protection of Nuclear Power Plants"

g. TVA NSRS Investigation Report No. I-85-693-WBN

h. Flow Diagram, Heating and Ventilating Air Flow, Additional DG Building 47W866-14 R2, (11/03/83)

1. Mechanical Drawing, Heating and Ventilating, Additional DG Building 17W910-3 R8, (08/30/85)

j. TVA Field Change Request (FCR) 3532, Deletion of fire dampers MK 47A381-597, (06/03/85)

k. TVA ECEP-SQN Restart Program - Corrective Action Plan (CAP)

Transmittal TCAB 006(11/07/86)

6. WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS, OR OTHER APPLY OR CONTROL IN THIS AREA?.

i a. TVA General Design Criteria No. SQN-DC-7.5, R1, " Fire Protection Systems"

b. TVA General Design Criteria No. SQN-DC-V-ll.l.2, R 1,

" Additional DG Building Environmental Control System"

c. NFC 90A 1003d '- 12/16/86

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rr ' TVA EMPLOYEE CONCERNS REPORT NUMBER: 231.4'(B)

. SPECIAL' PROGRAM REVISION NUMBER: 1 PAGE 7 0F 8

7. -LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEMENT.

a. RFI # ! SQN-526, (09-03-86)

'b. Telephone conversation from H. A. Mahlman, TVA, to W. M.

Blumer, Bechtel, dated (9-15-86) 4 ki l-1003d - 12/16/86

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. TVA EMPLOYEE CONCERNS . REPORT NUM3ER: 231.4-(B).

SPECIAL PROGRAM-REVISION NUMBER:- 1 I PAGE 8 0F 8 CATD LIST The following CATD identifies and provides corrective actions for the findings included in this report:

231.04 (B) SQN 01 (10/20/86)

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PAGE ~- 124 .i REFERENCE - ECPS120J-ECPS121C TENNESSEE VALLEY AUTHORITY FREQUEt4CY - REQUEST OFFICE OF NUCLEAR P0HER RUN TIME - 12:57:19 DNP - ISSS - RHM EMPLOYEE CONCERN PROGRAM SYSTEM (ECPS) RUN DATE - 12/02/86 LIST OF EMPLOYEE CollCERN INFORMATION CATEGORY: Ell DES PROCESS & OUTPUT SUBCATEGORY: 23104 LACK OF FIRE DAMPERS IN DIESEL GENERATOR ROOM

) S GENERIC P

KEYHORD A KEYHORD B H APPL QTC/NSRS CONCERN SUB R PLT BBSH INVESTIGATIO!! S CONCERN KEYHORD C CAT CAT D LOC FLQB REPORT R DESCRIPTION KEYHORD D g NUMBER IN 305-002 EN 23104 H HBH HNYY I-85-693-HBN SR THERE ARE NO FIRE DAMPERS IN DIESEL SAFETY CONDITION-T50160 REPORT GENERATOR BUILDING 85 LEADING TO THE DESIGN PROCESS FAN ROOM. IF A FIRE HERE TO BREAK HVAC

,3- OUT DOWNSTAIRS, THE FANS HOULD PULL THE FLAMES THROUGH THE FLOOR GRATING OF THE FAN ROOM. CONSTRUCTION DEPT CONCERN. CI HAS NO FURTHER INFORMA 3 TI0tl . NO FOLLOWUP REQUIRED.

1 CONCERNS FOR CATEGORY EN SUBCATEGORY 23104

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