ML19296D171

Supplemental Narrative Summary to RO 50-321/1979-021, Revision 5:on 791202,tritium Levels in Groundwater Samples Exceeded Limits.Caused by Leakage from Blown Seal on Condensate Transfer Pump.Pumps Temporarily Confined

ML19296D171
Person / Time
Site:	Hatch
Issue date:	02/18/1980
From:	GEORGIA POWER CO.
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ML19296D168	List: ML19296D166 ML19296D171
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NUDOCS 8002290432
Download: ML19296D171 (5)

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- FEBRUARY 18, 1980 SUPPLEMENTAL NARRATIVE

SUMMARY

TO LER 50-321/1979-021, REV. 5 '

EDWIN I. HATCH NUCLEAR PLANT - UNIT 1

. NONROUTINE RADIOLOGICAL ENVIRONMENTAL OPERATING

. AN0MALOUS MEASUREMENT REPORT This report, which supplements the previous submittals of LER 50-321/

1979-021, provides data on tritium levels in ground water samples taken from test holes A1, N98, P16, T4, T18, T12, T19 and catch basin PY12. .,

Analyses of samples from these test locaticn, averaged over the 4th quarter of 1979, exceeded the level of 3.0 E4 pCi/l as given in Table ,

. 3.2-3 of the E.T.S. There continues to be no significant impact on ,

the public health and safety due to these readings which exceed the reporting level . As reported previously any releases to unrestricted -

areas are through the outfalls of the drainage system; such releases

- are minuscule and result in insignificant doses to the public. The release rates and dose rates are no greater than those reported pre- -

. viously.

In recent calendar quarters there were five locations (Test Holes N9B, P16, P178, T4 and T18) from which the tritium levels in the

- groundwater samples were reported. Each of these test holes taps the water table. During the 4th quarter the tritium levels at Pl7B . '

continued to decline; the average level for the 4th quarter was 2.85 r

x 104 pCi/1 which is less than the 3.0 X 104 pCi/l reporting limit ,'

for offsite environmental samples; thus, the levels at Pl7B are not '

included in this supplement. The history of the tritium levels found in samples taken frcm each of the other four locations through the end of the 4th quarter of 1979 is provided in either Table 1 or i' Table 2. This were no dramatic changes in the tritium levels at these locations. .

As has been reported separately, on December 2,1979 a seal on one of the condensate transfer pumps blew resulting in the leakage of about 450 gallons of water from the CST-1 to the ground. Consequen tly , .

the tritium levels from the following locations exceeded the 3.0 x 104 pCi/l level: three adjacent test holes (Al, T12 and T19) each o'f which tap the water table; a catch basin (PYl2) of the surface -

drainage system; and a puddle on the surface of the ground near the offending pump. On December 3 the tritium levels were 6.18 x 10 5 .

pCi/l in the CST-1, 6.09 y 10 5 pCi/l in a water sample scooped from the puddle, and 6.10 x 103 pCi/l in A1. It appears obvious that the water taken from Al and the puddle is CST water which had leaked from the pump.

this occurred on Only Marchone13, sample 1979; had been previously obtained from Athetritiumle

,- pCi/l. Due to the shallowness of A1 (< 7 ft below grade) the water

.. 8002290 f 3 2__ -

Supplement f

~ ' '

February 18, 1980

table is almost always below the bottom of this test hole. The his-tory of the tritium levels found in samples taken from PYl2, T12 and T19 are listed in Table 3. The sudden rise of the tritium levels at PY12 and T19 in the samples collected soon after the cump leak show the leaked CST water reached these locetions promptly. The sluggish response in the rise of the tritium level at T12 provides an indica-

. tion of the required migration time to this point.

'~

'- To preclude or reduce releases under similar circumstances, temporary cor.finement m2asures about the transfer pumps are being made until a permanent fix can be installed. The temporary measures consist of the installation of metal reflectors to direct any spraying from the pumps or related plumbing to the concrete slab upon which the pumps

- are mounted; a curbing is being added around the concrete slab to

. prevent run off of the ground; a drain from the slab to rad waste is already in place.

The investigation of these high tritium levels continues. On September 20, 1979, a dye was injected in test holes Pl7B and T18 (each of which is adjacent to a known source or ex-source of tritium). Subsequent monitoring for the dye in samples from test holes and other points in '

the vicinity should aid in determining the pattern of underground mig-ration. On December 14 there was a sudden and strong appearance of dye in a sample from P16; the concentration increased in subsequent samples; the dye found here is believed to have migrated fro:a the in-jection made at TIS. Samples collected at N93 between November 9 and 30, and at T5 on November 9 and Decem.ber 6 also show the prei~. -

' sence of the dyc, but at much lower concentrations; the dye in these samples is believed to have migrated from Pl78. Although conclusion ~s cannot yet be reached from these scant results, such results do seem to support the prognoses made on migration ir an earlier supplement to this LER.

.to . =

a Supplement Februa ry 18, 1980

~

.~ .___ __

TABLE 1 HISTORY OF TRITItRt LEVELS AT EFFECTED

- SAMPLING LOCATICNS pCi/1 N9B P16 Da'te a

6/18/78 ' 1.64 1.44 (5)(5)b 8/08/78 3.55 (3) 3.48 (3) 1.51 (5) 8/31/78 9/29/78 3.67 (3)C 12/01/78 4.49 (3) 1/26/79 1.37 (5) 2/14/79 1.32 (5) -

2/16/79 9.63 (3) 1.21 (5) 3/09/79 -

3/13/79 2.80 (4)d 3/20/79 4.56 (4) 1.12 (5) 5.40 (4)* dry 3/27/79 4/04/79 5.97 (4)f 1.09 (5)8 4/10/79 1.07 (5) 6.79 (4)h 1.14 (5) 3 4/17/79 6.'67 (4)I 9.52 (4) l 4/24/79 6.60 (4) '

6.89 (4) 9.55 (4)

S/02/79 1.11 (5) 5/09/79 8.64 (4) 5/17/79 7.68 (4) 7.78 (4) 5/23/79 8.99 (4) 8.20 (4) 6/04/79 1.06 (5) '

6/05/79 7.66 (4) 6/13/79 1 02 (5) ~

6/26/79 1.43 (5) 7/11/79 1.37 (5) 7.62 (4) 7/26/79 8/09/79 1.47 (5)'l 6.07 (4) 1.43 1.28 (5) (5)k 6.62 (4) 8/24/79 '

9/05/79 7.66 (4) 9/06/79 1.34 (5) 9/18/79 1.42 (5) 7444 (4) 10/02/79 1.72 (5) 6.01 (4) 10/05/79 6.67-(4) 10/19/79 1.80 (5) 11/02/79 1.68 (5) 7.17 (4) 1.86 (5) dry 11/16/79 dry 11/30/79 1.55 (5) 6.55 (4) 12/03/79 5.31 (4) 12/14/79 1.58 (5)

• 12/26/79 1.79 (5) 6.59 (4) a) indicates 1.44 x 10 5 g) split 1.01 (5) b) recount 1.51 (5) h) split 6.90 (4) c) split 2.95 (3) 1) split 6.93 (4) j) split 1.41 (5) d) recount 2.25 (4) c) split 5.13 (4) k) split 1.28 (5)

• f) split 5.73 (4)

Suppicment February 18, 1980

TABLE 2 .

HISTORY OF TRITIUM LEVELS IN EFFECTED SAMPLING LOCATIONS I

pCi/1 I

T4 T18 Date ,

4/24/79 a e

4/27/79 6.27 4/29/79 2.41 (3)b (4) 5/01/79 4.77 (4) a j 5/02/79 dry j

5/03/79 7.33 (4) dry )

5/04/79 5/10/79 7.74 (4)  ;

5/14/79 / 7.lT (4) 6.07 (4) 5/16/79 5/17/79 4.66 (4) ,

5/21/79 ,

8.76 (4) 7.88 (4) 5/24/79 1 15 (5) 5/28/79 1.34 (5) 6.82 (4) 5/31/79 6.91 (4) 6/01/79 1.34 (5) .

6/05/79 1.41 (5) 6.49 (4) 6/11/79 7.02 (4) 1.56 (5)d 6.55 (4) 6/13/79 1.63 (5) 6/26/79 1.79 (5) 5.71 (4) 7/11/79 1.72 (5) 6.57 (4) 7/26/79 1.87 (5)* 8.83 (4)

' 8.08 (4) -;

8/09/79 2.05 (5) -

8/24/79 1.81 (5) ~8.27 (4) 9/05/79 7.18 (4) 9/06/79 9.22 (4)f 9/18/79 1.51 (5)B ~6.70 (4) 10/02/79 6.74 (4) 10/05/79 .

4.65 (4) 10/19/79 1.89 (5) 7.40 (4)

.11/02/79 1.66 (5) 7.64 (4)

~11/16/79 1.79 (5) 8.36 (4) 1.46 (5) dry

.11/30/79 12/05/79 7.06 (4) 12/14/79 1.35 (5) 6.02 (4) 12/26/79 1.55 (5) 6.75 (4) w a) installed 4 b) indicates 2.41 x 10 ,

c) split 6.72 (3) d) split 1.60 (5) c) split 1.75 (5) f) split 8.94 (4) g

8) split 1.52 (5) February 18, 1980

e

TABLE 3 HISTORY OF TRITIUM LEVELS AT EFFECTED SAMPLING LOCATIONS

, 'PCi/1 Date 'PY12 /* ' T12 T19 8/08/78 2.40 (3)*

8/31/78 9/29/78 1.54 1.63 (3)b (3) 9/29/78 1.34 (3)c .

12/01/78 5.00 (2) 2/22/79 ' 2.50 (2) 3/09/79 <1.45 (3) 4/10/79 <1.58 (3) 4/19/79 d 4/20/79 -

<1.20 (3) 4/23/79 . 2.50 (3) 4/24/79 4.76 (3) 4/26/79 1.46 (4)

... 4/30/79 2.21 (4) 5/03/79 2.'42 (4) dry d S/04/79 dry 5/07/79 2.26 (4) <1.62 (3)*

5/10/79 3.13 (4) <1.60 (3) 5/14/79 -

2.14 (4) 3.57 (3) 5/17/79 <1.60 (3) 1.24 (4) 5/21/79 <1.70 (3) 1.86 (4) 5/24/79 <1.70 (3) 1.91 (4) -

5/28/79 1.88 (4) 5/31/79 <1.70 (3)  :.1.98 (4) 6/05/79 <1.70 (3) 1.88 (4) 6/11/79 -

1.06 (3) 2.09 (4) 6/13/79 <1.60 (3) 1.72 (4) 6/26/79 -

1.59 (3) 2.06 (4) 7/11/79 1.04 (3) 1.74 (4)f 7/13/79 1.40 (2) 7/26/79 1.58 (4) 8/03/79 1.40 (2) 8/09/79 3.10 (2) 7.80 (2) .

1.52 (4) 8/24/79 1.25 (4)-

9/05/79 5.30 (2) 1.13 (4) 1.36 (4) 9/18/79 10/02/79 . 1.78 (4) 10/10/79 '2.67 (2) 8.22 (2) 10/19/79 2.23 (4) 11/02/79 1.95 (4)

- 11/09/79- 1.25 (3) 11/16/79 2.03 (4) 11/30/79 '1.58 (4) 12/03/79 5.60 (5) 12/04/79 2.56 (5) 12/05/79 5.47 (3) 12/14/79 2.76 (5) 12/26/79 3.65 (5) 1.96 (5) a) indicates 2.40 x 10 3 c) APT e) approximated date b) Teledyne d) installed f) split 1.88 (4) SuppleNnt February 18, 1980