ML19241B170
| ML19241B170 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/28/1979 |
| From: | Miraglia F NRC - NRC THREE MILE ISLAND TASK FORCE |
| To: | Stello V NRC - NRC THREE MILE ISLAND TASK FORCE |
| References | |
| NUDOCS 7907120737 | |
| Download: ML19241B170 (7) | |
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'S UNITED STATES
.377 flUCLEAR REGUL% TORY COT.P.*lSSION j
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'. I WASHINGTON, D. C. 20555
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- f NOTE T0:
V. Stello, Jr., Director, TMI Cperations FROM:
F. J. :tiraglia, Jr., Coordinator, Team B The attached report on penetration availability was prepared by IECB staff and is provided for your information.
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,A$ f, F. J.9tir liYJr.
Coordinator Team B
Attachment:
As Stated cc:
see attached distribution list c,.
abu_322 L
7907120737 P
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PENETRATION AVAIL's3ILITY ASSTRACT:
This report prasents, in abreviated form, a summary of the
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Staff's efforts in evaluating the ability to mor.itor the Three Mile Island Unit 2 reactor pressure and level using instruments outside of the containment.
INTRODUCTION:
The following penetrations were identified by Bill Millstead as being suitable for making pressure.neasurements during natural circulation.
(1) PR 533 (2) R 541 i
(3) R 546 (4) R 591 (5) R 592
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DISCUSSION:
It was recognized that some of these penetrations are separated N
i from the primary system by check valves which swing in the " wrong" direction, but Chuck Graves of the RSB has stated that pressure i
measurements can be made (once the valve is lif ted off of its seat) as long as no flow occurs in the out of centainment direction.
FINDI.* GS:
1.
The folicwing penetrations / valve strings are available for
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ceasuring pressure:
PENETRATION VALVES (inba2.d out)
(a) R 538 RC-Vil7 Pressurizer CA-V1 steam space RC-V122 Pressurizer CA-V3 water spa e RC-V123 RC-P-1A CA-V6 Suction 553323
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(b) R 541 MU-VlA or t'U-V1 B RC-P-1A and MU-V2A or MU-V2B Suction (both A or both B)
(c) R 591 or R592 RC Pump discharge Isolated by inboard check valve little or no flow will be tolerated (d)
R 546 CF-V3A or B Core Flood tank Vents WDG-V2 i
2.
The follcwing combinations of penetrations and valve strings are presented in Oghest to lcwest point of ccnnection to the primary system.
(a) R 546 CP V3A & WDG-V2 CF V3B & WDG-V2 (b)
R 538 RC-V117 & CA-V1 (c)
R 538 RC-V123 & CA-V6 R 541 MU-VIA & MU-V2A MU-V1B & MU-V2B t.
R 591 MU-V402C R 592 MU-V402D (d)
R 538 RC-V122 & CA-V3 3.
The following valves are not powered by onsite sources, RC-Vil7, RC-V122, RC-V123, CF-V3A, CF-V38, CF-V2A, and CF-V28.
4.
Of the valves which are powered by onsite sources, the folicwing penetrations are associated:
(a) R 538 Division 2(CA-V1, V3, V6)
(b) R 541 30th Divisions (MU-VlB & 2B)*
Division 1 (MU-ViA & P.A)*
- including interlocks (c) R 546 Division 2 ('.'DG-V2)
(d) R 591 & 592 No electrical calves inboard
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5.
The location of the sarple points are in TMI Unit 1 liuclear Sampling Rocm in the TMI 'Jnit 1 Control Tcuer and the Unit 2 Sample IDod.
6.
The elevations of the pipe runs and penetrations are not kno.sn.
7.
The following valves have been verified as meeting the qualifi-cations stated in FSAR Section 3.11.2 (60 psig, 286 F 1005 RH, and 2.8 x 10 Rad).
These are Limitorque valve actuators CA-V1 RC-Vll7 RC-V122 CA-V6 RC-V123 8.
The folicwing documents were used to obtain the information above:
PENETRATION REFERENCE (a) R 538 DWG 2034, 2031 FSAR Tables 6.2-15 9.3-2 FSAR Figures of 8.3 and 9.3-2 (b) R 541 D,!G 2024, 2029 FSAR Table 6.2-15 FSAR Section 8.3 (c)
R 546 DWG 2028, 2024, 2034 (d)
R 591 & 592 OWG 2024 3
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Conclusions:==
Based on the information which is presently available:
1.
lbst of the cotor operated valves of interest are Limitorque valves and are qualified beyond 2.8 x 10 Rad.
Therefore, radiation induced dam 3ge need not be considered.
2.
It is not prudant to use any of the available penetration points to attacpt to infer any sort of level information by differential pressure.
RECC "Et;DATIONS:
Eased on the available data and the conclusions v.hich are drawn therefrom the staff recem. ends:
1.
That the available penetrations not be used for differential pressure measurements until more is known about the actual routing (and therefore elevations) of the affected piping.
2.
That, should recomendations 1 be disregarded, the folicwing penetration /
valve pairs be used as (a)
First Choice:
Reference leg R 546 (CFV3A or CFV3B and WDG-V2)
Measured leg R538 (RCV122&CA-VB)
(b)
Second Choice R 546 (CFV3A or CFV3B and WDG-V2)
Measured leg R 538 (RC-V123&CA-V6)
(c) Third Choice Reference leg R 538 (RC-V117 & CA-V1)
Measured leg R 541 (MU-VlA & MU-V2A) or (MU-BlB & MU-V28)
(In the event that valves CF/WDA are used it will be necessary to charge the lines by filling the co e flooding tanks through the t42 supply or the tank cross ccnnect lines)
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(Itwillalsob? necessary to determine the relative heights of the penetration used to determine the level..hich is actually being raasured.
(It cculd and up being negative) t (The pressurizer must be flooded with ficw established via RCV177 & CA-VI if alternative 3 is used) This will result in an atmospheric release.
3.
The best penetration of system pressure measurement is R 533 via RCV122 &
CA-V3.
4.
All valves which are listed in Result 3 above should be opened at this time.
5.
Isometric drawings (with dimensions) should be provided for the following I
piping runs:
l (a) Pressurizer steam space sample line from the steam space to valve CA-V208.
(b) Pressurizer water space from the pressurizer water space to penetration R 538.
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(c) Reactor coolant pump RC-P-1A suction letdcwn tap to valve CA-V6.
t (d) Reactor Coolant punp RC-P-1A suction to valve MU-V376.
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i (e) Discharge of RC-P-2A to valve MU-V16C.
i (f) Discharge of RC-P-1A to valve MU-V160.
i (g) Core Flood Tanks lA and 18 to PENETRATION R 546.
6.
No external pressure measurement (except at the pressurizer) should be atte pted while a reactor coolant pump is operating.
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