ML20217D594

Proposed Tech Specs Re Change to Basis 3/4.6.4 Which Modifies Accuracy Range Associated W/Measured Std Cubic Feet Per Minute & Corrects Listed Component Number

ML20217D594
Person / Time
Site:	Millstone
Issue date:	04/30/1998
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20217D587	List: B17001, Provides Staff W/Change to TS Bases Section 3/4.6.4 for Info.Change Modifies Accuracy Range Associated W/Measured Std Cubic Feet Per Minute & Corrects Listed Component Number ML20217D594
References
NUDOCS 9804240386
Download: ML20217D594 (5)

Text

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Docket No. 50-423 817001 Millstone Nuclear Power Station, Unit No. 3 Marked Up Technical Specification Page l

l April 1998 9004240386 980417 PDR ADOCK 05000423 PDR p

7/30/97 CONTAINMENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL (Continued) 1.

Definitions and constants CFM - cubic feet per minute RPM - revolutions per minute Blower RPM

'4550 Blower ft*/ revolution

.028 ft*

Standard CFM - gas volume converted to conditions of 68'F and 14.7 psia.

2.

Measure and record the following information:

Pcontainment--Avera;e of 3LMS*P934, 935, 936, and 937 (psia)

Pout--From 3HCS 1A or B (psia)

Tc--Containment temperature (*F)

Pin--Measure with a new inlet gauge or calculate from Equation 3a below (psia) scfm measured--See Procedure / Form 3613A.3-1 AP,--From Table 2 (psi)

A--As found Slip Constant Accuracy--Instrument accuracy range from Table 1.

3.

Calculate as found slip constant (A) a.

Pin - Pcontainment - AP, scfm Accuracy J4 l Tc 4 460 3550 -

ineasured a

0.028

• 0.55

, Pin 528 m

A=

Egyi, 14.7 ' - 14.7 %, ' le l, Tc + 460 'I a

,, Pin

, Pin 528 j

I i

et;ILLSTONE - UNIT 3 B 3/4 6-3a Amendment No. p. 142 I

7/30/97 CONTAINMERT SYSTEMS B'ASES 3/4.6.4 COMBUSTIBLE GAS CONTROL (Continued) 4.

Calculate expected postaccident flow rate using A calculated in Step 3.

a.

Slip RPM

- A * (4.937)%

• 1.218 b.

Actual Inlet CFM ACFM

.028 (3550 - Slip RPM) c.

Standard CFM scfm - ACFM 0.725 d.

Postaccident scfm Minimum - scfm

• 0.53 e.'

Acceptance Flow Rate Postaccident scfm minimum 1 41.52 scfm.

Table 1 Accuracy Range (Ref. 2) scfm (measured)

Accuracy Ra' nae

'O 30 10t-40 9 13 set e 40 to450 6 'll ul4dHeim So todbo 5 BI S&fr" 60 56 toL9% 90 617 S$'4r7-sefs Table 2 Inlet Piping loss (Ref.1) scfm Heasured AP, (psi)

(Unad.iust ed) 30

.21 40

.31 50

.52 60

.73 70

.98 80 1.28 4

References:

1.

Calculation 90-RPS-722GM, " Flow Acce 3HCS*RBNR 1A/B Blowers 3HCS* CIA /B." ptance Criteria for 2.

Calculation PA 90-L0E-0132GE, "Hyurogen Recombindh Flow Error Analysis.'

e The acceptance flow rate is the required flow rate at the worst case containment conditions 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the LOCA. The analysis assumes the recombiners are started no later than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the accident. The 4530 18-month surveillance shall verify the gas temperature and blower flow rate concurrently.

MILLSTONE - UNIT 3 8 3/4 6-3b Amendment No. 77,142 04M

t Docket No. 50-423 B17001 i

l l

M;llstone Nuclear Power Station, Unit No. 3 Retyped Technical Specification Page i

i April 1998

\\

CONTAINMENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL (Continued) 1.

Definitions and constants CFM - cubic feet per minute l

l RPM - revolutions per minute l

Blower RPM - 3550 1

8 l

Blower ft / revolution =.028 ft I

Standard CFM - gas volume converted to conditions of 68'F and 14.7 psia.

l 2.

Measure and record the following information:

l Pcontainment--Average of 3LMS*P934, 935, 936, and 937 (psia) l Pout--From 3HCS*PIIA or B (psia) l l

Tc--Containment temperature ('F) 1 Pin--Measure with a new inlet gauge or calculate from Equation 3a below (psia) j l

scfm measured--See Procedure / Form 3613A.3-1 AP,--From Table 2 (psi)

A--As found Slip Constant Accuracy--Instrument accuracy range from Table 1.

3.

Calculate as found slip constant (A) a.

Pin - Pcontainment - AP, b.

3550

'[ '

~

measured 14.7

• Tc + 460 ll 0.028

• 0.95 Pin 528 A-Ecut

• 14.7

- 14.7 % * ' M

• Tc + 460' Pin Pin 528 4

l i

1 MILLSTONE - UNIT 3 B 3/4 6-3a Amendment No. 77, Jf7 0500