ML19283B708

In Response to NRC ,Requests Review & Evaluation of Time Required for Waste Transfer If Leak Develops in 8D-2 Waste Tank,Capability of Special Transfer Pump & Motor, & Adequacy of Radiological Controls

ML19283B708
Person / Time
Site:	West Valley Demonstration Project
Issue date:	06/27/1978
From:	Starostecki R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:	Deuster R NUCLEAR FUEL SERVICES, INC.
Shared Package
ML19283B706	List: ML19283B705 ML19283B708
References
NUDOCS 7903060633
Download: ML19283B708 (2)

Text

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UNITE D STATES

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• g NUCLEAR REGULATORY COMMisslON S

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WASHINGTON,0. C. 20SS5 e

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%... p.f J!M 2 7 :373 Docket No. 50-201

• • Mr. Ralph'W. Deuster. President 1

tiuclear Fuel Services, Inc.

1 6000 Executive Boulevard, Suite 600 "i

. Rockville, Maryland 20852 l

1

Dear Mr. Deuster:

In our letter dated June 2,1978 we forwarded to you a copy of the DuPont report entitled Safety Related Infomation. Available on f;FS Uaste Tanks. This report recemr. ended several actions that should be taken to both icprove the understanding of present waste tank system conditions and to provide increased readiness to respond to possible future waste tank problems. One of these recanended actions calls for a careful evaluation of the overall tice that would be required' to transfer waste frei the in-service tank BD2

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to the spare tank 801. ' Additionally, a careful review of the a

reliability of the special transfer ptmp and associated equipment i

and a careful review of the adequacy of the tank pucp-out procedure -

1 have also been recomended. This review and evaluation are needed to provide increased assurance that wasta tank transfer can proceed in a timely, safe and efficient r:anner should waste transfer became necessary. Accordingly, we request that you take the following action:

1.

Evaluate the overall time required to conduct waste transfer in the event a leak develops in 802. The overall time should begin with the initiation of leakage and conclude with the ccnpletion of waste transfer and any subsequent transfer line Ylushes and transfer equipment removal. This ei.aluation of the time required for waste transfer should include, but not necessarily be limited to:

4 a.

Estimates of leak rates; including assumptions used, b.

Time required to detect the leak.

c.

Reliability of waste tank pan high level alanns and the tank farm trouble alams.

d.

Reliability of the pan pumpout pumps.

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Ralph W. Deuster e.

Time to ptnp down condensate from spare tank 801.

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Tice to perfom each step in the 802 pumpout procedure.

l 2.

Verify the operational capability of the 8G2 special transfer pt:np g

and motor. This verification should be conducted on a periodic j

basis and should include but not necessarily be limited to:

.i gi a.

Routine electric checks on the motor, such as measurements I.;

of insulation resistance, amature resistance, etc.

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!i b.

Checks to verify the absence of binding of moving parts in both ptsp and motor.

c.

Ability of the pump to transfer solution containing i

suspended sludge.

d.

Ccnsideration of the need for backup transfer equipment.

3.

Evaluate the adequacy of the radiclogical controls needed during waste transfer. This evalaation should include as a minimum:

a.

A calculation of personnel exposure received during transfer equipment installation and waste transfer.

~

b.

A calculation of the effectiveness of the three feet thick dirt shield around the transfer line and the lead and concrete shield around the 801 and 8D2 pumpout and sample hatches.

c.

The need for installation of suitable leakage collection containments around transfer equipment stechanical joints.

Through discussions wthh members of your staff, it is our understanding that the 802 ptcpout procedure is in the process of being revised and updated. He would appreciate receiving a copy of the revised procedure as soon as it is completed.

Please provide us with the revised BD2 pumpout procedure and the evalua-tions requested above within twe months of the date of this letter. We would be happy to discuss these items with you at any time.

Sincerely.

Cnic.::11 E!:ned by R. W. Staro4 tee.hi Richard W. Starostecki, Chief Fuel Reprocessing and Recycle Branch Division of Fuel Cycle and Material Safety m,

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Nuclear Fuel Services, Inc. 6000 Executive Boulevard, Suite 600, Rockville, Maryland a 20852 Ei~ Eld A Subsidhry of Getty oil Company ge wm 0 01)770-5510 M8CCI16 ;!.i 10 5&ober 12,1978

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U.sg.'"-"]3T:3 Docket No. 50-201 w-[

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Mr. Richard W. Starostecki, Chief DOCKETED Fuel fleprocessing and Recycle Branch USNRC j

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Division of Fuel Cycle and Material Safety 6-

'I 0GT 171978 > 3

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U. S. Nuclear Regulatory Commission N

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Washington, D. C. 20535 RX1C sicnoN q

Reference:

NRC Le.tter to NFS dated June 27,1978

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Dear Mr. Starostecki:

Your letter of June 27th requested NFS to review and evaluate some specific actions recommended by DuPont in their report entitled " Safety Related Information Available on NFS Waste Tanks." Per your request, NFS has again i

]

carefully considered its procedure for the transfer of waste from the in-service l

tank 8D-2 to the spare tank SD-1 and has again concluded that the present procedures allow for such a potential transfer to proceed in a timely, safe and efficient manner; however, in the interest of additional conservatism, we are planning, as described below, to augment that procedure.

1. EVALUATION OF RESPONSE TIME *

a. Estimate of Leakage Rate Because the design and the operation of the waste tank SD-2 have been directed at avoiding the deficiencies that had arisen in some high level waste tanks at U. S. government sites, there has not been leakage from a similar waste tank; therefore, there is no historical base to estimate potentialleak rates. Any estimate of potentialleakage would be conjectural i

and is irrelevant because the permanently installed 8D-2 pan pump would return leakage of up to about 20 gpm back to the 3D-2 tank, thus eliminating or at least significantly reducing any postulated leakage.

b. Time Required to Detect Leak The liquid levels in the pan and in the vault of the 8D-2 waste tank complex l

are continuously monitored by instrumentation and annunciated, via a trcuble alarm, in the plant's Control Room as well as in the Waste Tank Farm Shelter. The liquid level detector in the 3D-2 pan is set to annunciate at six Inches, which is approximately 1,200 gallons. An operator, licensed by the U.S. NRC would acknowledge the alarm, investigate the cause, and report to a NRC-licensed Shift Supervisor, one of whom is always on site.

• Identification corresponds to that in referenced NRC letter.11-005 DM qc m 1o9 M

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Nuclsar Fuol Services, Inc.

Mr. Richard W. Starostecki October 12,1978 Page Two The Shift Supervisor is authorized by NFS to take any or all of the following actions should he suspect that. waste tank 8D-2 is leaking-

• withdraw a sample of the liquid from the 8D-2 pan for l

radiation / radioactivity measurement; i

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2 sample the a,irborne fadioacti'vity in the vault; l

i i Initiate pumpdown'of the ballast'11guid in 3D-1 waste tank; and/or, -

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.g.,/.* pump th.e 11 quid ac5]du!adingf n:. thy-k2:pa}r25.h' 2'Qaffsfal',[CM,U.

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the 3D-2 pan pump.

Meanwhile, the Shift Supervisor, in accordance with 'the ~ established- --

i Emergency Plan, would notify the members of the Plan Safety Committee.

i

c. Instrument Reliability '

The 3D-2 waste tank' pan level instrument, including the associated high ~

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i level alarm, is:

- - ~ -

~ monitored at least' once'each shift'by an NRC-Ilcense'd ~ operator who (1) records the pan level instrument reading on a-daily iFecord sheet pertinent only to the Waste Tank Farm; (2) functionally checked monthly by a sirnulated signal to the transmitter; this. check includes assuring'.that the "WTF Trouble" alarm annunciates -

i in the plan.t's Control Room;

.(3) calibrated every six months with simulated signals to the transmitter.

To reconfirm the pan level. detection s.ystem,. NFS willin the next month add -

water to the 3D-2 pan and verify' the instrument'r'e's'ponse. ~

~

d. Pan Pump Reliability Because of both' ttie' high in.tegrity of the 3D-2 vault walls and,the high

' ambient temperature in the.8D-2 vault, there has been no accumulation of

... moisture in.the 8D-2 pan; the.refore,.th,e pan, pump has' had _little service. ;..

While we have no reason 'to believe that the 3D-2 pan ~ pump would not

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operate properly if call'ed upon, we will test the 3D-2 pan pump during 1978 and annually thereafter by adding water to the pan and pumping it to Lagoon No.1 -via the installed.line.. The 80-l' pan pump.is' identical to the 8D-2 pan.

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~ pump and thereb'y serves'~as'a'.rejid.ily a'vailable sp~ari.

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1 Nuclear Fuol Services, Inc.

Mr. Richard W. Starostecki October 12,1978 Page Three

e. SD-1 Condensate Pumpdown A submersible pump in 3D-1 is used to remove condensate from'8D-1..Upon e

. removal, the condensate is either treated by ion exchange and routed to the lagoon system or returned to the 3D-2 storage tank. This presently installed 1

pump has a capacity of about 12-15.gpm. Because the minimum 8D....

l condenstate level will be maintained at about 120,000 gallons as an anti-bouyancy measure, it would presently take up to seven days (depending upon

' the amount of condenstate that the Safety Committee decided to remove) to' '

~- ' - (

, remove the condensate from 3D-1.

In order to significantly reduce the potential time requirements of this step In the waste transfer procedure, NFS has decided to replace ilie present pump with the special waste transfer pump (8G-2) which has a~ capacity of-about 100 gpm, thus reducing the maximum time requirements to about twenty hours. As indicated above, the 3G-2 pump will be used 'for the.

routine removal of condensate collected in 3D-1; therefore, its reliability

. ' will be' monitored.

f. SD-2 Pumoout Procedure

~

' On August 23rd, NFS delivered to' your Staff copies of "8D-2 Pumpout Procedure, Revision 1," which is the presently effective procedure for 1

responding to a potential leak in waste tank 3D-2. As noted above, NFS intends to install waste transfer pump (8G-2) in the spare waste tank (8D-1) as a means of routinely testing the availability of the transfer pump. When the installation is complete, the pumpout procedure will have been revised to reflect the status of the transfer pump.

Attached is our time and motion summary of the procedure which starts with 3G-2 in the 3D-1 tank.

2. OPERATIONAL CAPABILITY OF 3G-2 h

a. Motor Checks NFS will begin work on the installation of the special transfer pump (8G-2) in waste tank (8D-1) this month.

After installation, the pump will be functionally tested at least quarterly. In addition, the motor will be subject to NFS' routine preventative maintenance program.

b. Pumping Action The SG-2 pump, when installed in waste tank 8D-1, will be used to transfer the approximately 100,000 gallons per year of condensate that collects in 3D-1 to either waste tank 8D-2 or to the lagoon system. This will provide confirmation of proper pump performance.

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Nuclear Fuoi Services, Inc.

Mr. Richard W. Starosteckl October 12,1978 Page Four

c. Sludge PuEnping i The waste transfer pump, 3G-2, is a deep-well pump that was especially tj selected for the waste transfer operation. It is 'a two stage, centrifigal -

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pump rated to deliver the 100 gpm when pumping a sattfrated NANO solution at a specific gravity of IA and a temperature of 210 F. The pumf y

design includes a sparge ring at the pump inlet.

[.1 A -synthetic 3D-2 waste prepared by NFS to match the waste tank input records indicates that the sludge portion is relatively free flowing such that

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the bulk of the tank contents should be pumpable.

I

d. Back-co Transfer Equioment g9 Although NFS believes that the rugged 3G-2 pump would perform adequately for periods much longer than the relatively short time (less than 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />) necessary to transfer waste from 3D-2 to 8D-1, NFS is committing to-

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additional back-up transfer equipment as a " defense-in-depth."

NFS has initiated the purchase oil positive displacement pump capable of

' at least 100 gpm transfers. A formal procedure will also be developed for -

3q use of this pump should 3G-2 become inoperative.

3. RADIOLOGICAL CONTROLS

a. Personnel Exoosure f

l Although a highly unlikely event, the transfer of waste from 3D-2 to 8.D-1 l

would be a preplanned event involving rather straightforward techniques l

which would be conducted under the close scrutiny of the Plant Safety Committee and other management. With the operations preplanned, bulk shielding in place and personnel at a distance during the actual transfer j

operations, personnel exposure should be insignificant.

j pipe during the transfer.

Calculations (attached) show that this would The procedure calls for three feet of soil or equivalent shielding over the 1

reduce the radiation dose rate to less than 1 mr/hr at the surface of the dirt.

4

b. Shielding Effectiveness The three foot thick dirt shield called for in the procedure is only a target minimum. It could easily be augmented if dose rates were found to be higher than desirable during the actual transfer.

c. Joint Leakage The piping system is predominately welded, but there are some mechanical Joints.

The SG-2 pump specifications called for zero leakage past the

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Nuclear Fuol Services, Inc.

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Mr. Richard W. Starostecki October 12,1973 Page Five mounting flange. All joints would be assembled by maintenance personnel

.. skilled in assembling equipment for radiochemical service.

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We would be pleased to naet with your Staff and discuss these actions in

!:j additional detall.

On

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Very truly yours, d

3ames R.

ark Manager, Quality Assurance and Licensing i

3RC:jnW a

Enclosure d

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Rev. 2 10/13/78 Appendix A 8D-2 PUMP 0UT TIME ESTIMATE

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Sub-Total Total l

Man-Elap, sed Time Per Elapsed I

Job Hrs Time Job Time idl 1.

a. Assemble crane and move to

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WTF:

Crane operator 4 hrs Oiler

. 4_ hrs 8

4 b.

Prepare 80-1 area, make plastic bags, etc.:

2 Operators 4 hrs'-

12 6

i i

c.

Connect 80-1 pumpout line 2 Mechanics 2 hrs 4

2 2

~2 Pumpout 8D-1 to Lagoon 1.

2.

a.

Use 8G-2 0 100 gpm.

Assume 100,000 gal in 80-1 17 17 19 3.

a.

Prepare 8D-2 area for plug pulling and pump install-ation.

2 Operators 6 hrs 1 H&S

6. hrs 18 G

(6) b.

Remove port plug from 8D-2.

Crane Operator 4 hrs Oiler 4 hrs 2 Mechanics 4 hrs 1 H&S 2, hrs 18 4

(10)

2-Appendix A Sub-Total Total Man-Elapsed Time Per.

Elapsed Job Hrs Time Job Time _

RImove 8G-2 pump from 80-1 4.

a.

and install in 80-2 e,:

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Crane Operator 6 hrs "a

Oiler 6 Hrs

-j 2 Operators 6 hrs H&S

6. hrs 24 6

6 25' i

5.

a.

Connect discharge line from 8G-2 to 80-1.

'I crane Operator 1 hr 2 Mechanics 6 hrs Oiler 1 hr 8

6 6

31 c

6.

a.

Run water line to sparge ring on pump.

2 Mechanics 3 hrs 6

3 b.

Cover line from 8D-2 to 80-1 with 3' of dirt.

Bulldozer Op.

4 hrs Oiler 4_ hrs 8

4 c.

Shield around pump with lead and steel.

2 Operators 4 hrs 8

4 d.

Wire pump.

i 2 Electricians 8 hrs 16 8

8.

39 TOTALS 130 M-H 39 Hrs e

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10/13/78 I

i ie 8D-2 PUMP 00T TIME ESTIMATION i

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8 12 36 20 24 28 32 36 40 ElapsedTime(Hours)

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I; Appendix B

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BASIS FOR THREE FEET OF EARTH SHIELDING i

OVER TRANSFER LINE 4

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,.l The 80-2 solution has Cesium-137 and -134 isotopes as the principal gama emitters. A concentration of 5.5 mci /ml Cs-137 was used.

-3 The model for calculation was the series of point sources. The unshielded i}

dose rate at one meter was 22 Roentgens per hour.

The mass attenuation coefficients listed in the Radiological Health Hand-book were used to detemine half value layers and with the application of an. estimated dose buildup factor, a shielded dose rate was detemined to j

be 0.6 milliroentgens per hour.

The mathematical calculations were compared with standard shielding graphs from the Rad Health Handbook which generally confirmed attenuations of ten thousand fold by about 40 inches of earth.

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