ML20134F404

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Rev 0 to 96C001 to Approved Technical Safety Requirement Clarification (Tsrc) Index
ML20134F404
Person / Time
Site: Paducah Gaseous Diffusion Plant
Issue date: 10/15/1996
From:
UNITED STATES ENRICHMENT CORP. (USEC)
To:
References
96C001, 96C001-R00, 96C1, 96C1-R, NUDOCS 9611050216
Download: ML20134F404 (12)
v • d • e


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79-796

' DCTR Docum:nt C ntrol Tran:mittal Rec ipt Lockheed Martin Utmty Services, Inc.

T mittal, Number: 9076 Date: 10/25/1996 Site: PGDP l

Copyholder No: 567 Building:

Copyholder Name: DIRECTOR NRC-NMSS(COPY 1)

Mail Stop:

Address: % DR. CARL J. PAPERIELLO Phone: 301-415-7800 OFFICE OF NMSS,USNRC MAIL STOP-T-8-A23 WASHINGTON, DC 20555-0001 l SpecialInstructions:

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Document No Sheet No Bayhina Status Media Qty l

TSRC-96C001 0

0000 A

A 1

l SEE ATTACHED INSTRUCTION SHEET FROM DOCUMENT CONTROL FOR CORRECT PLACEMENT USEC-01 1 0

0006 A

A 1

PAGE REPLACEMENT FOR SECTION 2.4-15 IN VOL. IV OF USEC-01 ATTACHED l

Comments:

- Due Date: 11/08/96 l

Ise follow the transmittal instructions, sign, date and return by the above due date to Document Control (at PGDP: C-100,2nd Floor; i

ext. 5749; at PORTS: X-100, MS 1208, fax: ext. 2155). If you have any questions or you have changed location, phone number or no i

g;r need these documents, notify Document Control (at PGDP: ext. 5957; at PORTS ext. 3496).

l Signature Date l

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j 7GDP l

DOCUMENT CONTROL FAX NUMBER (502)441-5749 p,

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O Q{rh.LA WY 0 90 9611050216 961015 PDR ADOCK 07007001 C

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INSTRUCTION SHEET FOR ATTACHED CONTROIiLED TSR CLARIFICATION INSTRUCTED FROM NRA, WHICH MAY BE DESTROYED WHEN ADDITION IS COMPLETED.

l i

j Attached contents of document #TSRC-96C001, Rev. O, should be added to the back of Volume IV of USEC-01, rec 6, Application for NRC Certification.

l Should you have question, contact Document Control, x6261.

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l TSRC-96C001, Rev. 0 l

October 15,1996 l

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Approved Technical Safety Requirement Clarification (TSRC) Index TSRC Number Revision Affected TSR Approved Date Number 96C001 0

TSR 2.4.4.1 To rejlect date TSRCis approved 1

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l TECHNICAL SAFETY REOUIREMENT l -

CLARIFICATION (TSRC) REOUEST FORM (Sheet O

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PART I s INITIATION TSRC NUMBER: S/nCO O l 0

gevision: _

PORTS O PGDPA9 Technical Safety Requirements

Reference:

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OF CftL40u,r ByFAss Srmnus Description of Request:

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IEf Continued Date of Clarification Required: IDft %

Existing TSRC Number:

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Requestor:

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Organization: Flouffemt i

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Fur-6s Organization Manager: /M /

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Date:

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FORWARD TO NUCI MR REGULATORY AFFAIRS t{I I

PART II - NUCLEAR REGULATORY AFFAIRS-ASSESSMENT OF TSRC Techni:al Safety Requirement Clarification Required O

Tecenical Safety Requirement Clanfication Not Required i

Explain: Ecur tTt e.eth t o w O

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Technical Safety Requirement Change Required:

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NRA Manager Approval: IMbid ld!/

Tb Date:

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UE482 (8/23/96)

Page 2 of 2 (Back) t l@

TECHNICAL SAFETY REOUTREMENT l

_ CLARIFICATION (TSRC) REOUEST FORM (Sheet 2) l l

PART III - APPROVAL TSRC Number:

9(oC.00l Revision:

O Functional Organization Manager:

Date:

/0 6 d, NRA Manager:

/d.6fV Date:

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NRAP Manager:

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General Manage o>tJ M

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l I PART IV - CLARIFICATION CANCELLATION Reason For Cancellation:

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I NRA Manager Approval:

Date:

Functional Organization Manager:

Date:

NRAP Manager:

Date:

PORC:

Date:

General Manager:

Date:

l TSRC No: 96C001

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Revision: 0 Page1of5 C ""

TECIINICAL SAFETY REQUIREMENT CLARIFICATION

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con"oD oocume"i pGDP Paducah Gaseous Diffusion Plant TSR Section:

2.4.4.1 gt1 N TSR

Title:

UF, Release Detection System ud C PY,

con Clarification

Subject:

UF, Release Detection System - Definition of Cell and Unit Bypass Sections I.

Statement of Requested Clarification Clarify which UF6 detector heads are required to detect UF6 cut '.eakage from cell bypass piping and clarify the definition of unit bypass centerline.

II.

Background Information

(]

For cell bypass, a section is defined as "that portion of the cell bypass housing between any V

pair of opposite cells. Opposite cells are defined as 1 and 2,'3 and 4,5 and 6, etc." The intent of this statement was that " opposite cells" are defined as two cells, making a pair of

" opposite cells" equal to four cells. The other possible interpretation is that three heads must be operable between opposite cells. This is obviously not the intent because there are not three heads installed between opposite cells in '000' buildings. Clarifying the definition of which sections are specifically addressed is desirable. Clarification of the definition for unit bypass section and centerline is also needed.

IIL Clirification For '000' cell bypasses the sections should be defined as follows: the first section is defined as that section between the unit bypass and the long wing bypass between cells 3 and 5 (4 and 6); the second section is defined as that section between the long wing bypass between cells l

3 and 5 (4 and 6) and the long wing bypass between cells 7 and 9 (8 and 10); the third section encompasses the area from the long wing bypass between cell 7 and 9 (8 and 10) and the end of the cell bypass housing. 3 of 4 detectors are required to be operable in section 3 rather than 3 of 6 for the other sections.

For '00' cell bypasses, the sections are defined similarly. Since '00' units have no long wing bypasses, the dividing points are the section of housing between cells that connects the cell 3

housing to the cell bypass housing. Typically this division happens between detectors YE-19

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and YE-20 that are located near this dividing point.

..... =.. _.

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l TSRC No: 96C001 l -

Revision: 0 l

Page 2 of 5 TECIINICAL SAFETY REQUIREMENT CLARIFICATION l

Paducah Gaseous Diffusion Plant i

TSR Section:

2.4.4.1 l

TSR

Title:

UF, Release Detection System Clarification

Subject:

UF, Release Detection System - Definition of Cell and Unit Bypass l

Sections l

Unit bypass sections are defined as "that portion of the unit bypass between centerlines of adjacent units or from the centerline of the first or the last unit to the end of the housing."

l The centerline of a unit is the center of the cell bypass where it ties into the unit bypass. This l

divides the unit bypass into 5 sections in '00' buildings and 4 sections in '000' buildings.

The following 2 tables provide definition of the cell bypass detector heads in each section.

These heads are verified installed in the C-333 cell bypasses. The heads defined will be

,p verified installed in C-337, C-331, and C-335 prior to steady state operation above lV atmospheric pressure.

Cell Bypass Section Def"mitions for C-333 and C-337 '000' Buildings Three detectors in each of the following sections must be operable or l

4 LCO action steps shall be taken:

Section 1 Section 2 Section3 U-2-YE-16 U-6-YE-16 U-9-YE-16 U-2-YE-17 U-6-YE-17 U-9-YE-17 U-3-YE-16 U-7-YE-16 U-10-YE-16 U-3-YE-17 U-7-YE-17 U-10 YE-17 U-4-YE-16 U-8-YE-16 U-4-YE-17 U-8-YE-17 U-C-YE-XX

'U' indicates unit number; 'C' indicates cell number;

'XX' indicates head designation 1

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Page 3 of 5 TECIINICAL SAFETY REQUIREMENT CLARIFICATION Paducah Gaseous Diffusion Plant l

TSR Section:

2.4.4.1 l

TSR

Title:

UF, Release Detection System l

Clarification

Subject:

UF, Release Detection System - Definition of Cell and Unit Bypass Sections Cell Bypass Section Definitions for C-331 and C-335

'00' j

Buildings Three detectors in each of the following sections must be operable or LCO action steps shall be taken:

i Section 1 Section 2 Section3 U-1 A-YE-18 U-5-YE-18 U-9-YE-18 U-1 A-YE-19 U-5-YE-19 U-9-YE-20 U-l A-YE-20 U-7-YE-18 U-9-YE-22 l

U-1 A-YE-21 U-7-YE-19 U-9-YE-23 U-3-YE-18 U-7-YE-20 l

U-3-YE-19 U-7-YE-21 U-3-YE-20 U-7-YE-22 U-3-YE-21 U-7-YE-23 U-5-YE-20 U-9-YE-19 U-5-YE-21 U-9-YE-21 U-C-YE-XX

'U' indicates unit number; 'C' indicates cell number;

'XX' indicates head designation OO

,3 TSRC No: 96C001 i

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Revision: 0 s

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Page 4 cf 5 TECIINICAL SAFETY REQUIREMENT CLARIFICATION Paducah Gaseous Diliusion Plant TSR Section:

2.4.4.1 TSR

Title:

UF, Release Detection System Clarification

Subject:

UF, Release Detection System - Definition of Cell and Unit Bypass Sections Figure 1 - C-333 and C-337 Cell Bypass Section Definition '000' Buildings

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Page 5 of 5 TECIINICAL SAFETY REQUIREMENT CLARIFICATION Paducah Gaseous Diffusion Plant TSR Section:

2.4.4.1 TSR

Title:

UF, Release Detection System Clarification

Subject:

UF Release Detection System - Definition of Cell and Unit Bypass 6

Sections Figure 2 - C-331 and C-335 Cell Bypass Section Definition

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, TSR-PGDP August 1,1996 Rev. 5 USEC-01-1. Rev. 6 (Change 1)

SECTION 2.4 SPECIFIC TSRS FOR ENRICHMENT CASCADE FACILp l

2.4.4.1 UF RELEASE DETECTION SYSTEM C#

  • i 6

2.4.4.1 UF, RELEASE DETECTION SYSTEM (continued)

OCT I

SURVEILLANCs REQUIREMENTS:

j Surveillance Fkt!e$cy l

SR 2.4.4.1-1 " Test fire" the UF release detection system Twice each shift.

l 6

heads.

SR 2.4.4.1-2 Physically actuate (" smoke test") the UF release Annually 6

detector heads to verify alarms.

BASIS:

The reaction of UF and water (free atmospheric humidity) in the case of a UF release produces 6

6 uranyl fluoride (UO F ) as particulates and hydrogen fluoride (HF) as a gas which will hydrate.

I 2 2 The UO F and HF*x(H O) are highly visible as " smoke." This system detects the presence of this 22 2

" smoke' and sounds alarms in the ACR.

O n the event of a failure of the UF release detection system, the stationing of an operator at the 6

affected equipment would assure monitoring of the system to determine if any outleakage of UF, j

occurs and would provide the surveillance capability until the system could be repaired or the UF6 l

process equipment brought below atmospheric pressure. [SAR Section 3.3.5.9.4] The real safety I

hazard is when UF is released into the area inhabited by plant personnel. UF released inside the 6

6 heated housing is not of significant safety concern unless it leaks from the (non-air-tight) housing.

l Thus, a smoke watch posted outside the housing, watching for " smoke" escaping the heated housing into the occupied spaces, is capable of providing an adequate level of safety.

l o

Firing the heads at least once in an eight-hotir interval will maintain sensitivity of the heads in i

elevated tefnperatures such as that found in.the cell housings. [SAR Section 3.3.5.9.4] Detector heads are fired by supplying voltage to the head untilit alarms. This can be done by suppling voltage sufficient to fire the detector head. The firing of the heads will be recorded; this action l

i discovers heads which are failed.

Normal operational pressure transients may temporarily take the local process pressure to a value l

consistent with mode Cascade 2 values. These pressure transients typically work their way through those portions of the cascade that, by the optimized gradient, operate at mode Cascade 1 pressures quickly. This LCO is not intended to require UF release detection operability to 6

accommodate these transients. Instead, this LCO is intended to require system operability prior to intentionally increasing cascade pressure to mode Cascade 2 values.

C The cell bypass is perpendicular to cells and traverses the length of the individual unit. " Defined 6

section" means that portion of the cell bypass housing between any pair of opposite cells.

R Opposite cells are defined as 1 and 2, 3 and 4, 5 and 6, etc.

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n 2.4-15 v

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